Guida completa ai comandi di Linux

QuickReference (Vedi oppure Vedi)

* A *

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adduser

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agetty

agetty is a small version of getty, usefull only to login on virtual console or serials port. Sintassi: agetty [optios] < velocity > [,... ] < port > [tarminal] Opzioni: "port" is the device to use, like tty1 if you want to use /dev/tty1 "velocity" a comma separated list of bps velocity. "terminal" the kind of terminal emulation to use Options -h enable hardware control, i.e. RTS/CTS -i don't show the content of /etc/issue before the user logon -f < file > specify a diffent file to use instead of /etc/issue -I initialization string to send to the terminal -l specify a differnt program instead of /bin/login -m try to autoscan for the modem transmission velocity -t login timeout in seconds -w Wait for or before to send the issue file -----------------------------------------------------------------------

alias

Define an alias for a command. Typeing alias with no arguments cause to show the list of all the aliases Typeing an alias with no value cause to erase the alias for that name When defining a new alias there must be no blank-space between the name and the value Sintassi: alias [< name > [= < value > ] ... ] Example: alias dir='ls -al' -----------------------------------------------------------------------

alien

alien converts packages between different distribution into Debian o RedHat formats. Sintassi: alien {--to-deb | --to-rpm} [options] < package_name > ----------------------------------------------------------------------

apropos

Search into the 'whatis' database, that contain info about the command system, for one or more words. The 'whatis' database is generated thru' the command 'makewhatis'. apropos, instead of whatis, display all the string that match with the search pattern instead of only the first. -----------------------------------------------------------------------

arp

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ash

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arch

Display information upon the architecture of your machine -----------------------------------------------------------------------

at

Schedule a command for a single execution Sintassi: at [option] [datetime] Opzioni: [AM|PM] or [AM|PM] today tomorrow | | . . now + + < minutes | hours | days | weeks > -q < a..z> Specify the letter that identify the "queue" where to put the job -m Send a mail when the job is executed -f < file > Get the command to run from this file -l Act as 'atq' -d Act as 'atrm' -b Act as 'batch' -v In 'atq' mode let to know the execution time (1) at -f file_name [-m] time [date] "file_name" is the script to be executed "-m" send a mail message when the command is has been executed "time" must be in the format hh:mm am/pm or can be 'midnight' or in the form 'now+h' "date" must be in the form "Dec 25 1994" (2) at -l list the command scheduled (3) at -r job delete the scheduled command -----------------------------------------------------------------------

atq

List the content of an 'at' queue -----------------------------------------------------------------------

atrm

Remove a job from the 'at' queue -----------------------------------------------------------------------

atrun

This program is used internally by "cron" to see if there are jobs pending on the "at" or "batch" tail. It usually is run every minutes. -----------------------------------------------------------------------

awk

An interpreted language, very usefull for text manipulation and shell script. Synonims are gawk and nawk -----------------------------------------------------------------------


* B *
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badblocks

badblock is used to check the low-level integrity of a disk or partition, i.e. it check for bad blocks/clusters Sintassi: badblocks [optons] < device > < number_of_blocks > [first_block] Opzioni: -b < block_size > Tell the size of every block. Default value is 1024 -w LOW-LEVEL FORMAT YOUR DRIVE, DO NOT USE !!!! Esempi: badblocks /dev/fd0 1440 -----------------------------------------------------------------------

banner

Generate on the stdout a banner of the text specified on the command line. It is genereally used to print banners. -----------------------------------------------------------------------

bash

Bourne Again SHel This is just your shell, i.e. the "command.com" for windoze addicted Shortcut Effect Up Arrow Scroll the history backward Dn Arrow Scroll the history forward Left Arrow Move cursor back Right Arrow Move cursor forward Ctrl+b Move cursor back Ctrl+f Move cursor forward Backspace BackSpace Ctrl+d Delete a char Ctrl+a Move cursor to the start of the line Ctrl+e Move cursor at the end of the line Alt+f Move cursor one word forward Alt+b Move cursor one word backward Ctrl+l Clear the screen -----------------------------------------------------------------------

basename

Strip the path from a filename, and eventually also the suffix Sintassi: basename < pathname > [suffix] Esempi: basename /home/denny/test.awk Return "test.awk" basename /home/denny/test.awk .awk Return "test" -----------------------------------------------------------------------

batch

A job scheduler, the syntax is the same as 'at' but a job is executed only if the system is not heavy loaded. -----------------------------------------------------------------------

bc

A textbased calculator -----------------------------------------------------------------------

bg

Resume a suspended job in background. Sintassi: bg [job] -----------------------------------------------------------------------

biff

Check if you have new mail -----------------------------------------------------------------------

boot parameters

(Sorry, link unavailable) -----------------------------------------------------------------------


* C *
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cal

Print a calendar on the console Sintassi: cal [month] [year] -----------------------------------------------------------------------

calendar

A console program to manage a Diary -----------------------------------------------------------------------

cancel

Delete a print job -----------------------------------------------------------------------

cat

Display one or more files, usually is also used to append one file to another. Sintassi: cat [ option ] < file(s) > Examples: cat firstfile secondfile cat head body tail > dog Opzioni: "-A" "--show-all" show all the non-printable chars, act like "-vET" "-b" "--number-nonblank" number all the nonblank lines starting from 1 "-E" "--show-ends" append the symbol "$" at the end of each line "-s" "--squeeze-blank" substitute multiple blanklines with only one "-T" "--show-tabs" substitute the char with the symbol "^I" "-v" "--show-nonprinting" convert all the non-printable chars into a visible form -----------------------------------------------------------------------

cd

Change the current directory Esempi: cd /tmp Goes into the directory tmp cd ~ Go into the user's home directory cd ~kim Goes into the kim's home directory cd .. Goes to the higher level directory -----------------------------------------------------------------------

cdrecord

A cd writing program. -----------------------------------------------------------------------

cfdisk

cfdisk is like "fdisk" eccept that it use an interactive interface. Sintassi: cfdisk [options] [device] -----------------------------------------------------------------------

chattr

This program change the attributes of a file on a Ext2 filesystem Sintassi: chattr [options] [mode] < file > Options/Attributes: "+" Add the following attribute to the file "-" Remove the following attribute from the file "A" Tell to not update the access time (aime). This reduce the disk activity "a" Tell that a file can be only open in "append" mode when someone want to write "c" Let the kernel manage compression/decompression on the file (NOT IMPLEMENTED YET!) "d" Tell to the dump program that this program must no be backup-ed "i" The file is "immutable" "s" When the file is delete the block occupated by it are filled with zero. "S" Syncronize all the operation upon this file, without using the disk cache "u" Let undelete this file (NOT IMPLEMENTED YET!) -----------------------------------------------------------------------

chfn

Let to change the "finger" (name, address, telephone) information stored into /etc/passwd Sintassi: chfn [options] [user] -----------------------------------------------------------------------

chgrp

Change the group that own a file or directory. See "chown" for the complete syntax Sintassi: chgrp [options] [group] Opzioni: "-R" Change the permission into every sub-directory -----------------------------------------------------------------------

chmod

Change the permissions upon the specified file or directory Sintassi: chmod [options] < mode > < file > Opzioni: "-R" change the permission into the subdirectories Mode Sintassi: [ugoa][[+-=][rwxXstugo] "u" the user that own the file "g" the group that own the file "o" the other users "a" everybody "+" add those permissions "-" remove those permissions "=" assign those permissions "r" Add the read permission "w" Add the write permission "x" Add the execute permission "X" "s" "t" Enable the sticky bit. "u" Set the same permission has the user that own the file "g" Set the same permission has the group that own the file "o" Set the same permission has the "other" user -----------------------------------------------------------------------

chown

Change the user that own a file Sintassi: chown [options] [user][:|.][group] file Opzioni: "-R" change the permission into the subdirectories -----------------------------------------------------------------------

chroot

????? -----------------------------------------------------------------------

chsh

Let you change the predefinite shell into /etc/passwd. It is possible to set only an existing shell, mentioned into /etc/shells Sintassi: chsh [options] [user] Opzioni: "-s " "--shell " Let you specify a shell "-l" "--list-shells" Display the content of /etc/shells -----------------------------------------------------------------------

chvt

Change the current Virtual Terminal, i.e. switch the terminal like ALT +[Fn] programmatically -----------------------------------------------------------------------

clear

Clear the screen -----------------------------------------------------------------------

clock

Access the hardware clock of the machine Sintassi: clock [-u] [-r | -w | -s | -a] Opzioni: "-u" Set the clock in Universal Time (UTC) "-r" Display the hardware clock "-w" Update the system clock with the hardware clock "-s" "-a" Update the system clock with the hardware clock in conjunction with the error adjustment specified into /etc/adjtime Esempi: clock -w Update the system clock with the value into the BIOS -----------------------------------------------------------------------

cmp/comp

Compare two files -----------------------------------------------------------------------

compress

Old Compression utility, generate a file with .Z suffix. To unzip use uncompress Sintassi: compress [-v] < file_name > "-v" display the compression rate -----------------------------------------------------------------------

cp

Copy one or more file or directory Sintassi: cp [option] < source > < target > "-a" same as "-dpR", make an exact copy of everything (include symlink) "-b" maintain a backup copy of every file that is overwritten "-d" or "--no-deference" copy symlinks without the linked file "-f" or "--force" force overwrite of the target file "-i" or "--interactive" ask for confirmation before overwite any file "-l" or "--link" make hard-link instead of copy file "-P" or "--parents" Copy the path specified into the source "-p" or "--preserve" keep orignal date, owner and permission "-r" recursive copy every subdirectory, every file is considered normal "-R" or "--recursive" recursive copy every subdirectory "-s" or "--symbolic-link" make a symlink instead of copy the file (not true for directory) "-S < backup_suffix >" or "--suffix= " Specify a suffix to use when making backup copies of overwritten files "-V < backup_type >" or "--version-control=< backup_type >" Specify how to handle backup copies Backup Types: "t" "numbered" number every backup copy "nil" "existing" perform a numbered backup for only the file that already have been backup-ed with "t" "never" "simple" perform a simple backup, non numbered copy just only one Environment Variables: VERSION_CONTROL Contain the backup type. SIMPLE_BACKUP_SUFFIX Contain the suffix to use when making a "simple" backup Examples: cp -r /test/* ~/test cp -dpR /test ~/test -----------------------------------------------------------------------

cpio

Manage archive of files, like TAR. cpio is used instead of cp or other tools because: - It can access tape drives on other hosts using TCP/IP. - `-o' and `-p' can copy symbolic links either as symbolic links or, with `-L', as the files they point to. - `-i' automatically recognizes the archive format and tries to recover from corrupted archives. - The output of '-itv' looks like 'ls -l'. - It accepts long-named options as well as traditional single-character options. Syntax "copy-out " : cpio -o [options] [< name list] [> ] Read from the standard input a list of names (one for line) that are archived to the standard output Syntax "copy-in" : cpio -i [options] [ ] [< ] Read from the standard input the name of the archive from wich extract the files Syntax "copy-pass" : cpio -p [options] < target dir > [< name list >] Read from the standard input a list of names (one for line) that are copied to the destination directory Opzioni: "-o" "--create" copy-out "-A" "--append" Append data to an archive specified with the "-O" option "-L" "--dereference" copy only the symlink not the file "-O < archive name >" Specify the name of the archive to create or append instead of the standard output "-i" "--extract" copy-in "-d" "--make-directories" "-E < file >" "--pattern-file=< file >" Read a model that list the file to extract "-f" "--nomatching" Copy the files that do not match with the specified model "-I < archive >" Specify the name of the archive to use instead of the standard input "-t" "--list" List the content of an archive "-p" "--pass-through" copy-pass "-d" "--make-directories" "-l" "--link" create link instead of copy the files "-L" "--dereference" -----------------------------------------------------------------------

crond

This is the "daemon" that manage the system's job scheduler -----------------------------------------------------------------------

crontab

Let you modify the "crontab" file for a specified user. The crontab file is used by the daemon cron (a system scheduler) to run specified program at a given time. "crontab -l" view the current crond settings Sintassi: crontab [options] [file] Opzioni: -u Replace the crontab of the user with the specified file -l View the crontab of that user -e Create or modify the crontab of the user -r Delete the crontab of the user -----------------------------------------------------------------------

ctrlaltdel

????? -----------------------------------------------------------------------

cut

????? -----------------------------------------------------------------------

cu

Call another system via modem


* D *
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date

Show/modify the current system's date and/or time Sintassi: date [options] [+ format] [date] Opzioni: "-d < date >" "--date= " Display the date-time "-s < date >" "--set= " Set the new system's date-time "-u" "--universal" Display or set the date-time in universal time (UTC) Examples: date + "%r" display only the time date + "%D" display only the date Formats: %% Show a "%" %n newline %t tab %s number if second from the specified epoch %c same as the string "%a %b %d %X %Z %Y" %H hour in format 00..23 %I hour in format 00..12 %k hour in format 00..23 %l hour in format 00..12 %M minutes in format 00..59 %S seconds in format 00..59 %p AM or PM %Z include timezone %r time in 12 hour format ``hh:mm:ss AM/PM''. %T time in 24 hour format ``hh:mm:ss'' %X time like the string "%H:%M:%S" %a short week day name %A long day name %U week of the year, between 00..53 %w day of the week, between 0..6 where 0 is sunday %b Show month name %h like %b %B long month name %m month in format 00..12 %y year in format 00..99 %Y year in format 0000..9999 %d day of the month in format 00..31 %j day of the year in format 01..366 %D date in format `mm/gg/aa' %x local date view -----------------------------------------------------------------------

dbview

Utility to view DBase files -----------------------------------------------------------------------

dd

dd (Data Dublicator or Data Dump) is a low level copy program. Sintassi: dd [options] Opzioni: if=< file > Specify the input file or device of=< file > Specify the output or the device ibs= Specify a block size in byte for the input file obs= Specify a block size in byte for the ouput file bs= Ovveride both ibs and obs parameters cbs= Specify the dimension of the buffer used to convert the file skip= Specify how many block to skip before to start reading from the input file seek= Specify how many block to skip before to start writing to the output file count= Specify the amount of block to be copied conv= [, ]... Specify one or more conversion step Conversion types: ascii Convert from EBCDIC to ASCII. ebcdic Convert from ASCII to EBCDIC. ibm Converte from ASCII-IBM to EBCDIC. block Treat the input file like a set of record that end with the "newline" char. This record are trunced or expanded to fit the dimension of a block upon the output file unblock Every block of the input file is readed and the final spaces are substituted with a newline char. lcase Trasform from uppercase to lowercase ucase Trasform from lowercase to uppercase swab Exchange pair of byte, i.e. from bigendian to littleendian and viceversa noerror Ignore every error into the reading of the input file notrunc The output file isn't truncated if it is bigger than the required space sync Adjust the lenght of every input block adding a newline char at the end Suffixes: Every option that require a byte value or block lenght can be take a suffix to specify a greate quantity. These are: "b" specify block of 512 byte "c" char (1byte) "k" size is expressed in kilobyte (1024 bytes) "w" size is ( n * 2 ) "x " size is ( n * m ) Exampes: dd if=/vmlinuz of=/dev/fd0 This copy the kernel upon your floppy disk dd if=/vmlinuz of=/dev/fd0 obs=18k Same as above, but 3"1/2 floppy disk use a block size of 18 KB dd if=disk.img of=/dev/fd0 Copy an image upon floppy -----------------------------------------------------------------------

depmod

'depmod -a' will create the file 'modules.dep' under '/lib/modules'. This file is used to find the kernel modules by the "kerneld" daemon -----------------------------------------------------------------------

/dev

The dev directory contain special files that permit direct access to the hardware /dev/fd0 first floppy unit /dev/hda first IDE/EIDE hard disk /dev/hda1 first partition on the first IDE/EIDE hard disk /dev/hdb second IDE/EIDE hard disk /dev/sda fisrt SCSI hard disk /dev/sda1 first partition on the fisrt SCSI hard disk /dev/lp0 first parallel port /dev/lp1 second parallel port /dev/cua0 first serial port, i.e. COM1: /dev/ttyS0 first serial port, only in input /dev/null the NULL device, every read or write has no effect -----------------------------------------------------------------------

df

Display the amount of free space on the disks Sintassi: df [options] [device] Opzioni: "-a" "--all" Show info upon all the devices "-b" "--byte" Display memory in bytes "-h" "--human-redable" Display info into "human readable" form :-) "-i" "--inodes" Display size into inode "-k" "--kilobytes" Display memory in kilobytes "-m" "--megabytes" Display memory in megabytes -----------------------------------------------------------------------

dialog

A usefull program to display dialog in textmode -----------------------------------------------------------------------

diff

Compare two text files and create a 'diff' file to be used by the patch program to apply them. Used widely into the kernel (or large) development project Sintassi: diff [-b] [-i] [-w] < file or dir > < file or dir > "-b" treath multiple blank/spaces as only one "-i" ignore the char case "-r" recurse subfolders "-w" ignore tabs and space -----------------------------------------------------------------------

dir

You really don't know about this ?!? -----------------------------------------------------------------------

dircolors

Configure the color for the 'ls' command. Use: eval `dircolors [options] [file] Opzioni: If a file is not specified then dircolors try to use first ~/.dir_colors then it look for /etc/DIR_COLORS -----------------------------------------------------------------------

dircmp

Compare two directory -----------------------------------------------------------------------

dirs

Display the list of the directories stored into a stack. To save/restore a dir the command 'pushd' and 'popd' are used Sintassi: dirs [-l] [+/-n] Opzioni: "+n" Show only "n" elements form the top of the stack "-n" Show only "n" elements form the bottom of the stack "-l" Show the list into the "long" format -----------------------------------------------------------------------

dirname

Return the directory name from a filename specified in input Sintassi: dirname < file_name > -----------------------------------------------------------------------

disalloc

????? -----------------------------------------------------------------------

dmesg

????? -----------------------------------------------------------------------

dnsdomainname

????? -----------------------------------------------------------------------

domainname

????? -----------------------------------------------------------------------

dosfsck

????? -----------------------------------------------------------------------

dpkg

Debian Package Manager. Install, deinstall, update any debian package Sintassi: Usage: dpkg -i|--install <.deb file name> ... | -R|--recursive < dir > ... dpkg --unpack <.deb file name> ... | -R|--recursive < dir > ... dpkg -A|--record-avail <.deb file name> ... | -R|--recursive < dir > ... dpkg --configure ... | -a|--pending dpkg -r|--remove | --purge ... | -a|--pending dpkg --get-selections [ ...] get list of selections to stdout dpkg --set-selections set package selections from stdin dpkg --update-avail replace available packages info dpkg --merge-avail merge with info from file dpkg --clear-avail erase existing available info dpkg --forget-old-unavail forget uninstalled unavailable pkgs dpkg -s|--status ... display package status details dpkg --print-avail ... display available version details dpkg -L|--listfiles ... list files `owned' by package(s) dpkg -l|--list [ ...] list packages concisely dpkg -S|--search ... find package(s) owning file(s) dpkg -C|--audit check for broken package(s) dpkg --print-architecture print target architecture (uses GCC) dpkg --print-gnu-build-architecture print GNU version of target arch dpkg --print-installation-architecture print host architecture (for inst'n) dpkg --compare-versions < b > compare version numbers - see below dpkg --help | --version show this help / version number dpkg --force-help | -Dh|--debug=help help on forcing resp. debugging dpkg --licence print copyright licencing terms Use dpkg -b|--build|-c|--contents|-e|--control|-I|--info|-f|--field| -x|--extract|-X|--vextract|--fsys-tarfile on archives (type dpkg-deb --help.) For internal use: dpkg --assert-support-predepends | --predep-package | --assert-working-epoch Opzioni: --admindir=< directory > Use < directory > instead of /usr/var/dpkg --root=< directory > Install on alternative system rooted elsewhere --instdir=< directory > Change inst'n root without changing admin dir -O|--selected-only Skip packages not selected for install/upgrade -E|--skip-same-version Skip packages whose same version is installed -G=--refuse-downgrade Skip packages with earlier version than installed -B|--auto-deconfigure Install even if it would break some other package --largemem | --smallmem Optimise for large (>4Mb) or small (<4Mb) RAM use --no-act Just say what we would do - don't do it -D|--debug= Enable debugging - see -Dhelp or --debug=help --ignore-depends= ,... Ignore dependencies involving --force-... Override problems - see --force-help --no-force-...|--refuse-... Stop when problems encountered Comparison operators for --compare-versions are: lt le eq ne ge gt (treat no version as earlier than any version); lt-nl le-nl ge-nl gt-nl (treat no version as later than any version); < << <= = >= >> > (only for compatibility with control file syntax). Use `dselect' for user-friendly package management. Examples: dpkg -i Install the specified package dpkg -r Erase the previous installed package without deleting the configuration files dpkg --purge Full erase the installed package dpkg -l List all the installed packages dpkg -S Try to indentify which package contain the file specified into the model dpkg -C Check for pending packages to install -----------------------------------------------------------------------

du

Display the amount of space used by a directory or a file Sintassi: du [options] [dir or file ] Opzioni: "-a" "--all" Show info upon all the devices "-b" "--byte" Display memory in bytes "-c" "--total" Display a general total "-h" "--human-redable" Display info into "human readable" form :-) "-i" "--inodes" Display size into inode "-k" "--kilobytes" Display memory in kilobytes "-m" "--megabytes" Display memory in megabytes "-s" "--summarize" Display a total for every argument "-S" "--separate-dirs" Do not display the space used by subdirs "-x" "--one-file-system" Do not go into different filesystem mounted on some subdirs -----------------------------------------------------------------------

dumpe2fs

????? -----------------------------------------------------------------------

dumpkeys

Dump to the standard outpt the current keyboard map -----------------------------------------------------------------------


* E *
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echo

echo a string to the standard output Sintassi: echo [options] "string" Opzioni: "-n" do not start a new line "-e" enable parsing of escape sequences "-E" enable parsing of escape sequences Escape sequences: \a bell \b backspace; \c suppress the final newlin char \f form feed \n newline \r carriage return \t tab \v vertical tab \\ backslash \ooo a char code into octal system -----------------------------------------------------------------------

ed

A very old and very owful editor -----------------------------------------------------------------------

edquota

Let you assign and modify the "quota" for every user. This need the presence of the files quota.user and quota.group Sintassi: edquota [options] [user] Opzioni: "-u" Modify the user quota "-g" Modify the group quota "-p

egrep

Tee "E"xpanded version of "grep" -----------------------------------------------------------------------

elm

A (e-)mail client -----------------------------------------------------------------------

 

????? -----------------------------------------------------------------------

emacs

The most famous Unix program. A powerfull and customizable text editor -----------------------------------------------------------------------

env

Display all the environment variables -----------------------------------------------------------------------

exit

Exit, exits from a shell, from a "su" session, from a console and many more ... -----------------------------------------------------------------------

expand

????? -----------------------------------------------------------------------

explodepkg

Part of the Slackware distribution, unzip the content of a Slackware package -----------------------------------------------------------------------


* F *
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false

????? -----------------------------------------------------------------------

fastboot

????? -----------------------------------------------------------------------

fasthalt

????? -----------------------------------------------------------------------

fdformat

Format a floppy disk at low-level Sintassi: fdformat [-n] < device_name > Esempi: fdformat /dev/fd0 Format the disk into your drive A: -----------------------------------------------------------------------

fdisk

fdisk is a program to edit the partition table of your HD If you don't know what i'm talking about don't use it ! You may delete everything on your PC !! Sintassi: fdisk [options] [device] Opzioni: -l List all the partition on hard-disk IDE and SCSI -s < partition > Get the size of that partition -----------------------------------------------------------------------

fg

Resume a suspended job Sintassi: fg [job] -----------------------------------------------------------------------

fgrep

A version of "grep" with the "-f" parameters as default -----------------------------------------------------------------------

file

Tell you what kind of file is the one you specified. Require the file /etc/magic Sintassi: file [options] < filename > -----------------------------------------------------------------------

find

Search for one or more file and output his/their complete path Sintassi: find < starting_path > [options] Opzioni: "-atime +days" search file not accessed for n days "-depth" start from the last subdirectoy instead that from the root "-exec command \;" for every file execute a command "-iname < file_name >" search for a case-insensitive pattern "-mtime +days" search file not modified for n days "-name < file_name >" search for a case-sensitive pattern "-noleaf" do not optimize the search, to be used on cd-rom "-ok command \;" for every file execute a command asking user confirmation "-print" "-user < user_name > " "-xdev" search only into this Filesystem, does not search into mounted subdirectory (i.e., cdroms, NFSs) -----------------------------------------------------------------------

finger

Display the peoples connected to a computer -----------------------------------------------------------------------

flushb

????? -----------------------------------------------------------------------

fold

Wrap lines of a specified size -----------------------------------------------------------------------

free

Show the amount of free memory (RAM) Sintassi: free [options] Opzioni: -b Show size in bytes -k Show size in kilobytes -t Show a line with totals -o Disable buffer adjusting -s update results each the nr. of secs. -----------------------------------------------------------------------

fsck

Check the integrity of a filesystem. This is a front-end to a serie of fsck.* files like (fsck.ext2, fsck.dos, fsck.xia, ecc.) Sintassi: fsck [options] [-t ] [ ] -----------------------------------------------------------------------

fsck.ext2

This command, also know as "e2fsck", check an ext2 filesystem Sintassi: fsck.ext2 [options] Opzioni: -c Use "badblocks" to check damaged block -f Force the checking f the fs -F Flush the disk cache before to start checking -n Perform a read-only control without changing anything -p Perform an automatic repair of the filesystem -y like -p Exit status: 0 no errors 1 errors 2 errors upon a mounted FS, need reboot 4 errors not fixed -----------------------------------------------------------------------

fsck.msdos

This command, also know as "dosfsck" let you check a DOS-FAT16 filesystem. Sintassi: fsck.msdos [options] Opzioni: -a Perform an automatic repair of the filesystem -r Interactive repair of the filesystem -t mark not-readable cluster as bad-blocks Exit status 0 no errors 1 found solvable errors 2 syntax errors -----------------------------------------------------------------------

fsck.umsdos

????? -----------------------------------------------------------------------

ftp

Really don't know this ??? :-) -----------------------------------------------------------------------

funzip

????? -----------------------------------------------------------------------

fuser

Tell wich user is locking a file Sintassi: fuser [options] < file > Opzioni: -a Show all the listed files not only the used once -k Kill all the process that are using that files - Send the signal to the process who are using the file -m Means that the file is a device -u Tell the user that is owning the process who own the file -v Use a table format to show file in use -s Suppress output -----------------------------------------------------------------------


* G *
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gawk

A version of "awk" with the "-g" parameter by default -----------------------------------------------------------------------

genksyms

????? -----------------------------------------------------------------------

getkeycodes

????? -----------------------------------------------------------------------

getty

Getty is a program that is run at boot time. It let you login on your system. Sintassi: getty [options] [ [type] ] Opzioni: "-c " Check the syntax of a gettydefs file, like /etc/gettydefs "-d " Specify a configuration file rather tha /etc/gettydefs "-r " Second to delay before to display the login message "-w " Set a string to wait before to start to displaying the login prompt "-t " Set the timeout for the login Example (/etc/inittab) : # Start getty to listen on the first virtual console 1:12345:respawn:/sbin/getty tty1 # Start getty to listen on the second serial line s1:2345:respawn:/sbin/getty ttyS1 DT19200 vt100 -----------------------------------------------------------------------

getopt

????? -----------------------------------------------------------------------

getoptprog

????? -----------------------------------------------------------------------

gpm

A daemon to handle mouse selection, and also cut & past, in textmode Sintassi: gpm [options] Opzioni: -B < button order sequence > Set the button order sequence -t < type > Set the mouse type -2 Force a 2 button mouse -3 Force a 3 button mouse -S "command1:command2:command3" Set commands for the mouse "triple-click" Mouse types: mman Mouseman. ms Microsoft with 2 or 3 button bare Microsoft with 2 button msc MouseSystem with 3 button sun MouseSystem variant mm MMSeries logi Logitech serial mouse bm Microsoft BusMouse or compatible ps2 IBM PS/2 Busmouse and compatible (the ones with a circular connector) ncr NCR3125pen. wacom Wacom graphical table -----------------------------------------------------------------------

gpm-root

????? -----------------------------------------------------------------------

gpasswd

Change the shadow-password for a group stored into /etc/gshadow The password for a group is used to let users that are not member of this group to become parts of it by the command "newgrp" Sintassi: gpasswd [options] Opzioni: -A Modify the list of the administrators for that group -M Modify the list of user part of that group -a Add a user for that group -d Let an administrator to delete a member -r Let an administrator to delete a password -R Let an administrator to disable access through the use of password -----------------------------------------------------------------------

grep

Search for a pattern into one or more files Syntax "grep": grep [options] text_pattern file_names Syntax "egrep": grep [options] -e text_pattern file_names Syntax "ggrep": grep [options] -f text_pattern file_names Opzioni: "-c" output only the total of line matching the expression "-E" use an extended regular expression "-e" Specify a model to search "-F" use a fixed string model "-f" specify a file with the model "-G" use a normal regular expression "-h" suppress heading "-i" case insensitive "-l" display the name of the non-matching files "-l" display only the files name that content match the expression "-n" append the number of line "-v" search for lines that does not contain the text "text_pattern" can contain the following special chars "^" search for the text at the starting of the line "$" search at the end of the line -----------------------------------------------------------------------

groff

????? -----------------------------------------------------------------------

groupadd

Add a group to the shadow password Sintassi: groupadd [options] -----------------------------------------------------------------------

groupdel

Delete a group from the shadow password Sintassi: groupdel -----------------------------------------------------------------------

groups

Show the groups list or the group wich a user is member This command is the same as "id -Gn [user] " Sintassi: groups [users] -----------------------------------------------------------------------

grpck

Check the syntax of the file /etc/group and of /etc/gshadow (using also /etc/passwd Sintassi: grpck [-r] [ [ ]] "-r" force to program to not make any changes only to output problem -----------------------------------------------------------------------

grpconv

Convert the group file /etc/group into /etc/group and /etc/gshadow Sintassi: grpconv -----------------------------------------------------------------------

grpunconv

UnConvert the shadow password to the normal group /etc/group At the end the file /etc/gshadow is erased. Sintassi: grpunconv -----------------------------------------------------------------------

gtbl

????? -----------------------------------------------------------------------

gunzip

Uncompress a .gz file, compressed with gzip Esempi: gunzip -d backup.tar.gz will return "backup.tar" and erase backup.tar.gz -----------------------------------------------------------------------

gzexe

????? -----------------------------------------------------------------------

gzip

Compress one file. To unzip use the gunzip command Sintassi: gzip [options] [file] "-9" use the maximum compression value "-c" ouput the result to the standard output "-d" force decompression instead of compression "-r" recursively compress every file into a sub-directory "-t" check the integrity of compressed files Esempi: gzip -9 backup.tar create "backup.tar.gz" and will erase backup.tar


* H *
-----------------------------------------------------------------------

halt

????? -----------------------------------------------------------------------

hdparm

????? -----------------------------------------------------------------------

head

View only the first lines of a file Sintassi: head [-row] file_name -----------------------------------------------------------------------

help

Display the on-line help for a command -----------------------------------------------------------------------

history

Display the shell history -----------------------------------------------------------------------

hltest

????? -----------------------------------------------------------------------

hostname

?????


* I *
-----------------------------------------------------------------------

id

Display the user's ID (UID) or the group ID (GID) Sintassi: id [options] [user] Opzions: "-u" "--user" Display only the UID "-g" "--group" Display only the GID "-G" "--groups" Display only the numbers of extra group "-n" "--name" Display only the user or group name "-r" "--real" Display only the real UID/GID -----------------------------------------------------------------------

ifconfig

????? -----------------------------------------------------------------------

iflink

????? -----------------------------------------------------------------------

ifsetup

????? -----------------------------------------------------------------------

iawk

A version of "awk" with the parametes "-i" as default -----------------------------------------------------------------------

inetd

????? -----------------------------------------------------------------------

init

Init is the first task that the kernel execute. His job is to start, according to the choosen runlevel, the script for starting, stopping or rebooting the system. Sintassi: init [options] Opzioni: -t Nr. of seconds to wait before to change "runlevel" 0..6 Change to a runlevel between 0 and 6 a|b|c Run one of the "on demand" level q ReScan /etc/inittab s Go into single user -----------------------------------------------------------------------

info

A text-base reader for "info" documentation Sintassi: info [options] [voice] Opzioni: --directory Specify where to find info files -f < file > Specify an info file -n Specify a particular node Keyboard Shortcuts: q Quit the program h View the on-line help ? View the list of all available command d View the 'dir' file l Return back to the previous node n View the next node p View the previous node u View the upper node SPACE Scroll the node forward CANC Scroll the node backward b Go to the beginning of the node TAB move the cursor thru' the hyperlink ENTER go to the selected hyperlink s apple Search for 'apple' inside the text -----------------------------------------------------------------------

infocmp

????? -----------------------------------------------------------------------

insmod

Insmod is used to load a module into the kernel -----------------------------------------------------------------------

install

Copy a file assigning permission to it Sintassi: install [options] Options (see 'cp') : "-b" "--backup" "-S" "--suffix" "-V" "--version-control" Options : "-d < directory >" Create the specified dirs "-g " Specify the owner group "-m " Specify the permission "-o " Specify the user who own the file -----------------------------------------------------------------------

installpkg

This install a Slackware Package Sintassi: installpkg [options] < package_filename > "-warn" Don't perform the installation just prompt what will happen "-r" Use current directory as root for installing the package "-m" Make a package from the content of the current directory -----------------------------------------------------------------------

ipfwadm

?????


* J *
-----------------------------------------------------------------------

jobs

Display the list of jobs Sintassi: jobs [options] [job] Opzioni: -l Display with PID -p Display only PID -n Display only the jobs that toggled their fg/bg state -----------------------------------------------------------------------

joe

A usefull editor, also included in my "Little Italy Linux" It accept command like the old Turbo Pascale editor Commands: CTRL + K + F Search/Replace CTRL + K + S Save current file without quitting CTRL + C Quit without to save, loosing chages CTRK + K + Z Quit saving if changed something


* K *
-----------------------------------------------------------------------

kbdrate

Used to change the keyboard rate/delay -----------------------------------------------------------------------

kbd_mode

Change the keyboard mode. This program is only used to debug a new keyboard layout. Please don't use them if you are not Linus Torvald. -----------------------------------------------------------------------

kd

????? -----------------------------------------------------------------------

kermit

One of the most famous program in the world, with "hallo world". It's an old communication program thru' serial lines, we suggest to use 'minicom' if you want test you internet connection. -----------------------------------------------------------------------

kerneld

kerneld is a 'daemon' that provide auto-load of modules. As example, if you need PPP, kerneld will automatically load it when necessary without running the modprobe or the insmod command. The behaviot of kerneld is controlled by the file '/etc/conf.modules' -----------------------------------------------------------------------

kill

Send a "signal" to a process Sintassi: kill [options] [PID] Opzioni: -s Specify the name or number of the signal to send -l Display a list of all the available signal Signals: 1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP 6) SIGIOT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP 21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ 26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO 30) SIGPWR -----------------------------------------------------------------------

killall

Send a signal to all the process who are executing a specified command Sintassi: killall [options] [ - ] [ ] -----------------------------------------------------------------------

killall5

????? -----------------------------------------------------------------------

 

This is the daemon to log the kernel messages. Sintassi: klogd [-f log_file] -----------------------------------------------------------------------

ksyms

?????


* L *
-----------------------------------------------------------------------

last

Display log information about the "login" and the "logout" from /var/log/wtmp of all the user or only from a single user Sintassi: last [options] [user] Opzioni: - or -n Display only "number" events -----------------------------------------------------------------------

ldconfig

Update the file /etc/ld.so.conf.cache and all the system libraries, also add symlink to the right librarie version -----------------------------------------------------------------------

ldd

List the libraries required by a program -----------------------------------------------------------------------

less

See the 'more' program that have an equivalent syntax -----------------------------------------------------------------------

lesskey

????? -----------------------------------------------------------------------

lilo

Sintassi: lilo [options] -C < configuration file > Specify a configuration file rather than /etc/lilo.conf -r Specify a pseudo-root dir -----------------------------------------------------------------------

/etc/lilo.conf

This is the configuration file used by "lilo" It accept the following options : boot=/dev/hda Specify on which partition or device will be installed LILO. Don't user /dev/hda if you installed WindowNT as your default system. prompt Tell LILO to dispay a prompt when it start timeout=50 Number of 1/10 seconds to wait before LILO exit from the prompt and load the default image image=/boot/vmlinuz With this line start a definition of a Linux kernel image to be loaded. Every line after this will be refered to this image. label=linux Name to be used for the image at the LILO prompt root=/dev/hda2 Specify wich partition must be mounted as root (i.e. /) for the specified image read-only Needed if you are mounting an ext2fs partition other=/dev/hda1 With this line start the definition of a image to be loaded of another OS. label=dos Tell the label to use. table=/dev/hda ( I DON'T KNOW !) -----------------------------------------------------------------------

ln

Create a link (hard or symbolic) to one or more files or dirs Sintassi: ln [options] source_file(s) target_file_or_dir Opzioni: "-n" ask before overwrite an existing file with a link "-s" make a symbolic link instead of an "hard link"
"-b" or --backup "-f" or --force "-i" or --interactive "-S" or --suffix "-V" or --version-control "-d" or "-F" or "--directory" Permit to create and hard link to a directory "-n" or --no-dereference -----------------------------------------------------------------------

loadlin.exe, loadlinx.exe

Boot a Linux kernel from DOS Sintassi: Esempi: LOADLIN c:\vmlinuz root=/dev/hda2 ro Boot an ext2 partition on /dev/hda2 LOADLIN c:\vmlinuz root=/dev/hda1 rw Boot an umsdos partition loadlinX c:\vmlinuz root=c: rw Boot an umsdos partition upon C: -----------------------------------------------------------------------

loadkeys

Load the keyboard layout, like dos keyb xx Sintassi: loadkeys [file] -----------------------------------------------------------------------

loadunimap

Load an Unicode map -----------------------------------------------------------------------

locale

Display/Set the LOCALE information (i.e. internetional settings) Sintassi: locale [options] Opzioni: -a | --all-locale Show all the LOCALE name -m | --charmaps Show all the avilable char maps -----------------------------------------------------------------------

logger

Logger let you add information to the system log Sintassi: logger [-f file_to_include] [message] -----------------------------------------------------------------------

login

????? -----------------------------------------------------------------------

logname

Output the name of the user you have used at login prompt, reading it from /var/run/utmp To know which user are you currently using use 'whoami' instead. -----------------------------------------------------------------------

losetup

Used to configure a "loopback" device -----------------------------------------------------------------------

lp

Print a file Sintassi: lp [-c] [-d < printer >] [-m] [-n < copies >] [-o < print_options > ] [-P < page_to_be_printed >] [-w] < file_to_print > Opzioni: "-c" make a copy of the file to be printed "-d" specifies an output printer "-m" send a mail message when the print job is completed "-n" number of copies to print "-o" specifies print Opzioni: nobanner, nofilebreak, cpi= lpi= , lenght= i, lenght= l, width= width= i "-P" specifies which pages have to be printed "-w" display a message on the screen when the print job is completed -----------------------------------------------------------------------

lpr

??????????? -----------------------------------------------------------------------

lpq, lpstat

List the status of all the printers -----------------------------------------------------------------------

ls

List the files present into a directory Sintassi: ls [options] Opzioni: "-l" display info into a "long" format "-a" display all the files including hidden files "-A" like "-a" but does not show the "." and ".." directory (VERY USEFULL) "-q" Change non-printable chars with the "?" symbol "-R" Recurse thru' subdirectories "-t" Sort the result starting from the most recent modify-date "-c" Sort the result starting from the most recent change-date "-u" Sort the result starting from the most recent access-date "-e" Display full date time for the files. "-i" Show inode "-r" Sort in reverse order "-B" Ignore backup files (~) "-C" Use a vertical format organized in columns "-F" Apped a char at the end of a file, depending on its type: * program; / directory; @ symlink; | pipe; = socket "-S" Sort by size "-X" Sort by extension "-1" format using a single column, one file per line "-w " Set the width of the ouput, used if you have a screen more than 80 chars or less "-I " Exclude listing of the specified patterns -----------------------------------------------------------------------

lsattr

Show the attribute of a file on an ext2 file system Sintassi: lsattr [options] < files > Opzioni: "-R" Recurse thru' subdirs "-a" All files, including hidden "-d" Also list subdirs -----------------------------------------------------------------------

lsdev

????? -----------------------------------------------------------------------

lsmod

List all the modules loaded into the kernel Sintassi: rmmod [-r] [module_name] If the -r parameter is specified then rmmod try to 'recursively' remove all unneeded modules depending on the specified once. -----------------------------------------------------------------------


* M *
-----------------------------------------------------------------------

make

The second most know program by programmers :-) Make is used to execute makefiles that usually automate the process of compiling your software project -----------------------------------------------------------------------

makepkg

Use to create a Slackware Package -----------------------------------------------------------------------

makewhatis

This will create the 'whatis' database -----------------------------------------------------------------------

mail

A Mailing program -----------------------------------------------------------------------

man

The manpages viewer Sintassi: man [options] [name] Opzioni: A section number is between 1 and 9, see manpages below -f Act like 'whatis' -h Show guide -k Act like 'apropos' -----------------------------------------------------------------------

manpages

manpages are usually stored into /usr/share/man , dependly on their extension they handle different topics, depending on their category: 1 user command 2 syscall 3 library function 4 devices 5 file formats 6 games 7 misc 8 system commands 9 kernel routine -----------------------------------------------------------------------

mattrib

????? -----------------------------------------------------------------------

mc

The famous "Midnight Commander", a clone of the Norton Commander dos program. This is included by default into my "Little Italy Linux" -----------------------------------------------------------------------

mcd

????? -----------------------------------------------------------------------

mcopy

????? -----------------------------------------------------------------------

mdel

????? -----------------------------------------------------------------------

mdir

????? -----------------------------------------------------------------------

mgetty

mgetty is the daemon that allow you to login onto your system. Its a very complex program. Sintassi: mgetty [options] < linea-tty > Opzioni: "-x " Verbose Level from 0 (none) to 9 "-s " Port speed "-r" Use a serial line with no modem "-p " Customize the login prompt "-i " Use a custom issue file instead of /etc/issue Examples: mgetty -r -s 19200 ttyS1 mgetty -r -x 9 -s 19200 ttyS1 -----------------------------------------------------------------------

mesg

Enable/disable the display of messages on the screen using the comamnd "write" Sintassi: mesg [y|n] -----------------------------------------------------------------------

mev

????? -----------------------------------------------------------------------

mformat

????? -----------------------------------------------------------------------

mingetty

A small version of getty with no modem or serial line support to reduce memory use. Do not use any configuration file. Sintassi: mingetty [options] [virtual console] Opzioni: --noclear Do not clear the screen before the login --long-hostname Display the complete computer name at the login prompt Esempi: mingetty tty1 -----------------------------------------------------------------------

mkdir

Create one or more directories Sintassi: mkdir [options] < directory > ... Opzions: "-m | --mode= " Define permission "-p | --parents" Create the full-tree of parent dirs not only the target child "--verbose" Verbose -----------------------------------------------------------------------

mkfifo

Create one or more FIFO (named pipe) mkfifo [options] < file > Opzioni: "-m < mode > | --mode=< mode >" Define Permissions -----------------------------------------------------------------------

mkfs, mkfs.ext2, mkfs.msdos, mke2fs

Make an ext2 file system on the specified device Syntax for ext2 fs : mke2fs [options] < device > [dimension in blocks] Syntax for dos fs : mkedos [options] < device > [dimension in blocks] General Syntax : mkfs [ -t < fs type > ] [options] < device > [dimension in blocks] Opzioni: "-b < block size >" "-c" Check badblocks "-i " "-q" Silent "-S" Write only the superbock (Latest recover resource) -----------------------------------------------------------------------

mkinitrd

????? -----------------------------------------------------------------------

mkisofs

Make a ISO-9660 filesystem (cd-rom) image from the specified directory Sintassi: mkisofs [options] < directory > Opzioni: "-a" Include all files "-f" Symlinks are converted into the pointed files "-m < model >" Exclude all the files or dirs that are present into the model "-o < file >" Specify the output file for the image "-R" Add the Rock-Ridge extensions "-r" Adjust permission for the file into the ISOfs "-T" Enable the creation of files TRANS.TBL into every directory "-v" Verbose "-x < directory >" Exclude that directory -----------------------------------------------------------------------

mklost+found

????? -----------------------------------------------------------------------

mknod

Create a FIFO or a special device file. Sintassi: mknod [options] < file > [ < major nr. > < minor nr. > ] Tyep: "p" Create a FIFO "b" Create a block buffered device "c" Create a char buffered device "u" Create a char unbuffered device Opzioni: -m [ | --mode=[ ] Set permission -----------------------------------------------------------------------

mkswap

Initialize a swap partition Sintassi: mkswap [-c] < device of file name > -----------------------------------------------------------------------

mlabel

????? -----------------------------------------------------------------------

mmd

????? -----------------------------------------------------------------------

modprobe

modprobe is used instead of 'insmod' because it use 'modules.dep' to find the dependencies the module need. In this way modprobe load all the needed modules while insmod load only the specified modules. Sintassi: modprobe [options] [module_name] [module_parameters] Opzioni: -a Load all the modules -c Show the current configuration -l List all the available modules -r Remove all loaded modules -----------------------------------------------------------------------

more

Display the standard input one page at time on the screen Sintassi: more [options] [file] Esempi: cat /etc/passwd | more more /etc/passwd Keyboard Shortcuts q Quit the program h Show the on-line help SPACE Show the next page ENTER Show the next line b Show the previous page /apple Search the text for 'apple' n Find the text again CTRL+l Refresh the current screen The 'less' command, additionally can use the arrow and page key to scroll the text also if it cames from the standard input. Also it have this additional shortcut: y Show the previous line ?apple Search backward for 'apple' N Repeat last backward search -----------------------------------------------------------------------

mount

Mount the filesystem from a device into a directory (the mount point). Sintassi: mount [ -t < fs_type>] [-o ro|rw] < device_name > < mount_point > Esempi: mount -t vfat /dev/fd0 /floppy mount the windoze floppy a: under /floppy mount -t iso9660 /dev/scd0 /cdrom mount your scsi cdrom under /cdrom mount -a mount all the filsystems into /etc/fstab mount -a -t nomsdos,nonfs mount all the filsystems into /etc/fstab execpt the once that are of type msdos and nfs Opzioni: "-a" Mount all the FS into /etc/fstab execpt the once makerd with 'noauto' "-t < FS-type > Specify the FS type "-o < FS-Option > Specify "rw" or "ro" to mount the fs read/write or read/only -----------------------------------------------------------------------

mrd

????? -----------------------------------------------------------------------

mread

????? -----------------------------------------------------------------------

mren

????? -----------------------------------------------------------------------

mtools

????? -----------------------------------------------------------------------

mtools.script

????? -----------------------------------------------------------------------

mtype

????? -----------------------------------------------------------------------

mv

Move files or directory, also rename, because rename is just as moving into the same directory Sintassi: mv [options] < source > < target > Opzioni: -b | --backup -f | --force -i | --interactive -S | --suffix -V | --version-control -----------------------------------------------------------------------

mwrite

?????


* N *
-----------------------------------------------------------------------

namei

Parse a pathname into all his parts Sintassi: namei [options] < pathname >... -----------------------------------------------------------------------

netstat

????? -----------------------------------------------------------------------

nice

Run a command at a specified priority ( "nice" ) Sintassi: nice [options] [command] [arguments] Opzioni: -n < nice > Assign a priority from -20 (higher) to +19 (lowest) -----------------------------------------------------------------------

nisdomainname

????? -----------------------------------------------------------------------

nohup

Run a command in a way that it cannot be interrupted with the signal (SIGHUP) Esempi: nohup yes > /dev/null & -----------------------------------------------------------------------

newgrp

Change the group of the current user Sintassi: newgrp [group]


* O *

open

open let you start a command upon a new virtual console Sintassi: open [options] [--] < command > [command options] Opzioni: -c < console number > Specify a virtual console to use -l Treath the command as a login shell


* P *

pack

Pack a file with ".z" extension -----------------------------------------------------------------------

passwd

Change your password or the once of a specified user Sintassi: passwd [options] [username] Opzioni: "-s" view status information -----------------------------------------------------------------------

paste

-----------------------------------------------------------------------

patch

Apply a patch to one or more files. The patch is usually created with the 'diff' command -----------------------------------------------------------------------

pathchk

Check a list of path Sintassi: pathchk [options] [pathname ... ] -----------------------------------------------------------------------

pcomm

-----------------------------------------------------------------------

pfdisk

-----------------------------------------------------------------------

pkgtool

Handle Slackware Package maintainance (add, remove, ecc.) -----------------------------------------------------------------------

pidof

-----------------------------------------------------------------------

ping

-----------------------------------------------------------------------

popd

This is not the MAIL daemon ! Its a utility to get-off from the directory stack an item pushed with "pushd". Sintassi: popd [+/-n] -----------------------------------------------------------------------

powerd

UPS power daemon -----------------------------------------------------------------------

pr

Format a text file -----------------------------------------------------------------------

procinfo

-----------------------------------------------------------------------

ps

Display information about the processes currently running on the system Sintassi: ps [-l] [-a] [-e] [-f] [-t ] [-u < user_names >] "-l" display with long format "-f" display the process dependencies (see pstree) "-a", "-e" display all process "-t" view process started from that terminal "-u" view process started from that user "-x" view process that run in background "-r" view only the running process "-h" strip the header from the ps list -----------------------------------------------------------------------

pstree

Display running process with a graphical tree Sintassi: pstree [options] [ PID | user ] Opzioni: "-a" Show the command-line "-p" Show the PIDs "-u" Show UUID transaction Esempi: ps -u -p -----------------------------------------------------------------------

pushd

Add a directory on the top of the directory stack Sintassi: pushd [< directory >] | pushd [+/-n] -----------------------------------------------------------------------

pwck

pwck check the integrity of the file /etc/passwd and /etc/shadow Sintassi: pwck [-r] [ < passwd-file > [shadow-file]] Opzioni: "-r" read-only check, do not fix anything -----------------------------------------------------------------------

pwconv

Convert your /etc/passwd into /etc/passwd and /etc/shadow. Password are removed from the /etc/passwd file. If /etc/shadow already exist it is simply updated. This program does not get any parameters, any default value is taken from /etc/login.defs -----------------------------------------------------------------------

pwd

pwd (Print Working Directory) output the name of the current directory Sintassi: pwd [options] -----------------------------------------------------------------------

pwunconv

pwunconv make the reverse work of "pwconv". It convert /etc/shadow into /etc/passwd then erase it. -----------------------------------------------------------------------


* Q *
-----------------------------------------------------------------------

quota

The quotha manager, handle the amount of space a user can consume upon a system Sintassi: quota [ options ] Opzioni: -u [ user ] Get the quotas for the specified user -g [ group ] Get the quotas for the specified group Examples: quota Get the quota for the current user -----------------------------------------------------------------------

quotacheck

Scan all the partition to update the files quota.user and quota.group, its good to do this at boot time Sintassi: quotacheck [ options ] [{< partition >|< mount-point >}...] Opzioni: -u Scan user quota (default) -g Scan group quota -a Scan all the partition into /etc/fstab -R Scan all the partition into /etc/fstab except "/" (root) Examples: quotacheck /dev/hdb2 quotacheck /mnt/disco2 quotacheck -avug -----------------------------------------------------------------------

quotaon

Enable quota manager Sintassi: quotaon [ options ] [{< partition >|< mount-point >}...] Opzioni: -u Enable user quota -g Enable group quota -a Enbale quota according to /etc/fstab Examples: quotaon /dev/hdb2 quotaon /mnt/disco2 quotaon -avug Questo corrisponde all'utilizzo normale del programma, per attivare la gestione delle quote in tutte le partizioni montate e registrate nel file /mnt/disco2 come soggette al controllo delle quote, sia degli utenti che dei gruppi. -----------------------------------------------------------------------

quotaoff

Disable quota manager Sintassi: quotaoff [ options ] [{< partition >|< mount-point >}...] Opzioni: same a "quotaon" -----------------------------------------------------------------------


* R *
-----------------------------------------------------------------------

rarp

-----------------------------------------------------------------------

rcp

Remote copy of file between computer -----------------------------------------------------------------------

rdev

Utility to set parameters into a kernel image Sintassi: Esempi: rdev kernel_image device_name Specify a new root device rdev -R kernel_image 1 Specify to mount the root filesystem as read only rdev -R kernel_image 1 Specify to mount the root filesystem as read/write rdev -s kernel_image device_name Specify to use a default swap file rdev /dev/fd0 /dev/hdb1 Configure the image upon a floppy to mount the rootFS from the first partition onto the secondary EIDE disk -----------------------------------------------------------------------

read

Bash command to read a string from standard input Sintassi: read [-a < array > ] [-p < prompt > ] [-r] [ < variabile >... ] Opzioni: -r Parse "\" as a valid char -a < array > Fill a specified array with the parsed values -p < prompt > Output a prompt -----------------------------------------------------------------------

reboot

-----------------------------------------------------------------------

removepkg

Deinstall a Slackware Package Sintassi: removepkg [-warn] < package_name > Opzioni: "-warn" do not really remove the package only warn -----------------------------------------------------------------------

renice

Run a command at a specified priority ( "nice" ) Sintassi: renice [ [-p] ... ] [ [-g] ... ] [ [-u] ... ] Opzioni: -g Specify a group PID (PGRP) -u user Specify a user name -p Specify a PID -----------------------------------------------------------------------

repquota

repquota emit a report of the quota usage Sintassi: repquota [ options ] [{< partition >|< mount-point >}...] Opzioni: see "quotacheck" -----------------------------------------------------------------------

request-route

-----------------------------------------------------------------------

reset

Reset the terminal if a lot of strange characters appear on your screen. Sometimes this is a shell script. -----------------------------------------------------------------------

rlogin

Remote Login to a computer -----------------------------------------------------------------------

rm

Remove one or more file or an entire directory tree Sintassi: rm [option] < target > Opzioni: -r | -R | --recursive Recursively delete file into a directory -i | --interactive Ask before to remove -d | --directory Threat directories as files -f | --force Ovverride the -i parameters and delete without asking any confirmation -----------------------------------------------------------------------

rmdir

Erase any specified directory Sintassi: rmdir [ options ] < directory >... Opzioni: -p | --parents Erase also the parent directory if it is empty -----------------------------------------------------------------------

rmsmod

Remove a module from the kernel Sintassi: rmmod [-r] [module_name] If the -r parameter is specified then rmmod try to 'recursively' remove all unneeded modules depending on the specified once. -----------------------------------------------------------------------

rn

Newsgroup reader -----------------------------------------------------------------------

rootdev

-----------------------------------------------------------------------

route

-----------------------------------------------------------------------

rpm

RedHat Package Manager, it install, deinstall, upgrade, etc., every RedHat package Syntax (user rpm --help to gain the full help): RPM version 2.3.10 Copyright (C) 1997 - Red Hat Software This may be freely redistributed under the terms of the GNU Public License usage: --help - print this message --version - print the version of rpm being used -q - query mode --root < dir > - use < dir > as the top level directory --dbpath < dir > - use < dir > as the directory for the database install, upgrade and query (with -p) allow ftp URL's to be used in place of file names as well as the following Opzioni: Package specification Opzioni: -a - query all packages -f < file >+ - query package owning < file > -p + - query (uninstalled) package --whatprovides < i > - query packages which provide < i > capability --whatrequires < i > - query packages which require < i > capability Information selection Opzioni: -i - display package information -l - display package file list -s - show file states (implies -l) -d - list only documentation files (implies -l) -c - list only configuration files (implies -l) --dump - show all verifiable information for each file (must be used with -l, -c, or -d) --provides - list capabilities package provides --requires -R - list package dependencies --scripts - print the various [un]install scripts -V -y --pipe - send stdout to --verify - verify a package installation using the same package specification options as -q --dbpath < dir > - use < dir > as the directory for the database --root < dir > - use < dir > as the top level directory --nodeps - do not verify package dependencies --nomd5 - do not verify file md5 checksums --nofiles - do not verify file attributes --setperms - set the file permissions to those in the package database using the same package specification options as -q --setugids - set the file owner and group to those in the package database using the same package specification options as -q --install -i - install package --prefix < dir > - relocate the package to < dir >, if relocatable --dbpath < dir > - use < dir > as the directory for the database --excludedocs - do not install documentation --force - short hand for --replacepkgs --replacefiles -h --hash - print hash marks as package installs (good with -v) --ignorearch - don't verify package architecture --ignoreos - don't verify package operating system --includedocs - install documentation --nodeps - do not verify package dependencies --noscripts - don't execute any installation scripts --percent - print percentages as package installs --replacefiles - install even if the package replaces installed files --replacepkgs - reinstall if the package is already present --root < dir > - use < dir > as the top level directory --test - don't install, but tell if it would work or not --upgrade -U - upgrade package (same options as --install, plus) --oldpackage - upgrade to an old version of the package (--force on upgrades does this automatically) --erase -e - erase (uninstall) package --allmatches - remove all packages which match (normally an error is generated if specified multiple packages) --dbpath < dir > - use < dir > as the directory for the database --nodeps - do not verify package dependencies --noscripts - do not execute any package specific scripts --root < dir > - use < dir > as the top level directory -b -t - build package, where is one of: p - prep (unpack sources and apply patches) l - list check (do some cursory checks on %files) c - compile (prep and compile) i - install (prep, compile, install) b - binary package (prep, compile, install, package) a - bin/src package (prep, compile, install, package) --short-circuit - skip straight to specified stage (only for c,i) --clean - remove build tree when done --sign - generate PGP signature --buildroot < s > - use s as the build root --test - do not execute any stages --timecheck < s > - set the time check to S seconds (0 disables it) --rebuild - install source package, build binary package and remove spec file, sources, patches, and icons. --recompile - like --rebuild, but don't build any package --resign + - sign a package (discard current signature) --addsign + - add a signature to a package -K --checksig + - verify package signature --nopgp - skip any PGP signatures --nomd5 - skip any MD5 signatures --querytags - list the tags that can be used in a query format --initdb - make sure a valid database exists --rebuilddb - rebuild database from existing database --dbpath < dir > - use < dir > as the directory for the database --root < dir > - use < dir > as the top level directory -----------------------------------------------------------------------

rsh

Execute a command on a remote computer -----------------------------------------------------------------------

runlevel

-----------------------------------------------------------------------


* S *
-----------------------------------------------------------------------

script

Save into a text file every command you issue from the keyboard. Very usefull for making shell script Sintassi: script [-a] < file > Opzioni: "-a" Append the typed command to a pre-existing script file rather than creating a new one To quit the recording use the 'exit' command. -----------------------------------------------------------------------

sdiff

Compare two files -----------------------------------------------------------------------

set

Used to set some 'bash' behavious Sintassi: set [flag] [ ... ] Flags: -a Automatically export any modified or create vars to the shell -b Immediately report the status of a teminated background job -e Immediately quit if a command return a value not zero This not work if the command is inside of a while loop, an if statement, a list "&&" o "||" or if the command was inverted with "!" -f Disable file/path globbing -h Store into a cache the position of each executable file that is run -k Export to any sub-command every local variable -m Enable Job control -n Read command without execute (used to perform syntax checks) -o

shift

Shift the program parameters of "n" positions except $0 Sintassi: shift [n] -----------------------------------------------------------------------

syslinux.exe

Make a DOS Floppy disk capable of boot linux, offering many advanced features. -----------------------------------------------------------------------

syslinux.cfg

Configuration file for syslinux Opzioni: DEFAULT linux Tell to use "linux" as default label TIMEOUT 50 Specify how many 1/10 of seconds to wait to start the default kernel To wait forever specify 0 (zero) DISPLAY INTRO.TXT Display the content of the file INTRO.TXT PROMPT 1 Ask user for something. Set to 0 to override this F1 INTRO.TXT Set the F1 key to display this text, and so on for F2, F3, ecc. LABEL linux Define a label KERNEL LINUX Specify which kernel image to load for the last labeò LABEL floppy Special label to tell to insert a new floppy with a compressed root partition ramdisk image LABEL hda1 Tell to start with the kernel on /dev/hda1 -----------------------------------------------------------------------

sed

Stream Editor, process text file -----------------------------------------------------------------------

set, setenv

Set an environment variable -----------------------------------------------------------------------

setfont

Load a specified font file, or the default if nothing is specified Sintassi: setfont [ options ] < font-file > -----------------------------------------------------------------------

setkeycodes

-----------------------------------------------------------------------

setleds

Change the keyboard's led state Sintassi: setleds [options] [[+|-]num] [[+|-]caps] [[+|-]scroll] Opzioni: "" If you run the program with no options you will get the current settings "-D" Settings are stored so a 'reset' command will not change them "-L" Change only the led status but not his meanings. -----------------------------------------------------------------------

setserial

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setterm

-----------------------------------------------------------------------

sh -> bash

-----------------------------------------------------------------------

ship

-----------------------------------------------------------------------

showfont

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showkey

Display the keycode for every key you press. The program quit after 10 seconds of inactivity. Sintassi:showkey [ options ] -----------------------------------------------------------------------

shutdown

Halt or reboot a machine Sintassi: Opzioni: "-h" halt the machine "-r" reboot the machine -----------------------------------------------------------------------

signals

*Signal* *Action* *Description* SIGHUP A The Terminal hang-up (lost connection). SIGINT A Program Interrupted (usually CTRL+C) SIGQUIT A Program Quitted. SIGILL A Illegal Instruction. SIGABRT C Program aborted (interruped by the system). SIGFPE C Floating Point Exception. SIGKILL AEF Process Killed. SIGSEGV C Segmentation Fault (You have problem with your system). SIGPIPE A Broken Pipe. SIGALRM A Timer Alarm. SIGTERM A Program Terminated (maybe with KILL -TERM ...). SIGUSR1 A User Signal 1. SIGUSR2 A User Signal 2. SIGCHLD B A child process is quit. SIGCONT If stopped, restart the execution. SIGTSTOP DEF Immediatly stop the process. SIGTSTP D Stop signal from a keyboard command. SIGTTIN D Background process who need input. SIGTTOU D Background process who need output. *Actions* A process is quitted; B signal ignored; C make a "core" dump; D process is stopped; E process cannot be catched; F process cannot be ignored. -----------------------------------------------------------------------

sleep

Wait "n" seconds -----------------------------------------------------------------------

 

Static "ln" -----------------------------------------------------------------------

 

Sort a text file -----------------------------------------------------------------------

spell

Check the spelling of a text file -----------------------------------------------------------------------

 

-----------------------------------------------------------------------

 

Static SYNC -----------------------------------------------------------------------

stty

Change settings of the terminal Sintassi:stty [options | < configuration >] Opzioni: "-a" Show the current configuration -----------------------------------------------------------------------

su

Let you login as another user without exiting from your current console session. If no user is specified the 'root' user is used as default. Sintassi:su [ options ] [ user ] -----------------------------------------------------------------------

sulogin

-----------------------------------------------------------------------

swapoff

Disable the use of the swap partition Sintassi:swapoff [ options ] [ device ] -----------------------------------------------------------------------

swapon

Enable the use of a swap partition or file Sintassi:swapon [ options ] [ device ] Opzioni: "-a" Enable all the swap partition defined into /etc/fstab Examples: # swapon /dev/hda3 Enable the swap partition /dev/hda3. # swapon /swap1 Enable the swap file /swap1. # swapon -a Enable the swap partition specified into /etc/fstab, if any. -----------------------------------------------------------------------

switchto

switchto is used to switch the screen to another virtual console without pressing any key Sintassi: switchto [virtual console number] -----------------------------------------------------------------------

sync

sync perform the flush of the file cache buffer, writing pending information to the disk Sintassi: sync [ options ] -----------------------------------------------------------------------

syslogd

syslogd is the daemon that take care of booking every system event. It's configuration file is /etc/syslogd.conf Sintassi: syslogd [ options ] Options : -f < configuration file > -m < minutes > -p -----------------------------------------------------------------------

sysvbanner

-----------------------------------------------------------------------

svatextmode

SVGATextMode is used to resize the console size at any time. Its configuration file is /etc/TextConfig Sintassi: SVGATextMode[ options ] [configuration voice] -----------------------------------------------------------------------


* T *
-----------------------------------------------------------------------

tac

Display a file in reverse order, from the bottom to the top. tac works as the opposite of cat. See cat for command options. Sintassi: tac [ options ] [file... ] -----------------------------------------------------------------------

tail

Display the last lines of a file Sintassi:tail [-r] [- ] < file_name > Opzioni: "-r" view in reverse order -----------------------------------------------------------------------

talk

Talk with another user -----------------------------------------------------------------------

tar

tar (Tape ARchive) manage archive files Sintassi: tar [c|r|t|u|x|A][options][f < tar_file >] < file_names > Opzioni: "c" copy on a new file or floppy "r" copy at the end of a pre-existing archive "t" view files inside of an archive "u" Update archive with only new files "-A" Append files to a pre-existing archive "-d" Find difference between the files into the archive and the filesystem "--delete" Delete from an archive all the specified files "x" extract files from the archive "l" display an error message if the desidere file is not found "o" when extracting a file use the current user attributes instead of the orginal file owner "v" view name of the file being processed "w" ask before to copy any file "0-9" device number "f" specify the archive file name "-r" o "--append" Aggiunge dati a un archivio già esistente. "-t" o "--list" Elenca il contenuto di un archivio. "-u" o "--update" Aggiunge solo i file più recenti rispetto a quanto già contenuto nell'archivio. "-x" o "--extract" Estrae i file da un archivio. "--atime-preserve" Fa in modo che la data di accesso dei file che vengono archiviati, non venga modificata. "-f < file >" Emette l'archivio nel file o nel device. Se si tratta di un file normale, questo viene creato. "-h" o "--dereference" Non copia i link simbolici, ma i file a cui questi fanno riferimento. "-k" o "--keep-old-files" In fase di estrazione da un archivio, non sovrascrive i file eventualmente già esistenti. "-l" o "--one-file-system" Quando viene creato un archivio, resta in un solo filesystem: quello di partenza. "-L " o "--tape-length= " Definisce la dimensione massima dei vari segmenti di copia multivolume. "-m" o "--modification-time" In fase di estrazione da un archivio, non viene ripristinata la data di modifica dei file. "-M" o "--multi-volume" Permette di creare, elencare o estrarre un archivio multivolume. "-N " o "--newer " Archivia solo i file la cui data è più recente di quella indicata come argument. "-O" Estrae i file nello standard output. "-p" o "--preserve-permissions" Estrae tutti i permessi associati ai file. "-P" o "--absolute-path" Estrae i file utilizzando i percorsi assoluti, cioè senza eliminare la prima barra (/) che appare nei nomi di percorso (pathname). "--remove-files" In fase di creazione di un nuovo archivio, elimina i file archiviati. "--same-owner" Durante l'estrazione da un archivio, assegna ai file estratti le proprietà originali. "-v" o "--verbose" Elenca i file che vengono elaborati. "-W" o "--verify" Cerca di verificare la validità dell'archivio dopo averlo creato. "-Z" Filtra l'archivio attraverso il programma di compressione compress. "-z" Filtra l'archivio attraverso il programma di compressione gzip. Esempi: # tar -c -f /dev/fd0 -L 1440 -M -v /usr Archivia la directory /usr/ con tutto il suo contenuto, comprese le sottodirectory, utilizzando i dischetti (da 1440KB). Con la copia multivolume, come in questo caso, non è possibile utilizzare la compressione automatica attraverso l'opzione -z o -Z. # tar -t -f /dev/fd0 -L 1440 -M -v Visualizza l'elenco del contenuto dell'archivio fatto su dischetti. # tar -x -f /dev/fd0 -L 1440 -M -v -p --same-owner Estrae il contenuto dell'archivio su dischetti a partire dalla posizione corrente. È probabile che le options -p e --same-owner siano già predefinite a causa di una opportuna modifica fatta da chi ha realizzato la distribuzione Linux. In ogni caso vale la pena di ricordarsene. # tar -c -f /tmp/archivio.tgz -z -v /usr Archivia il contenuto della directory /usr/ nel file /tmp/archivio.tgz dopo averlo compresso con gzip -----------------------------------------------------------------------

tee

Copy text between a pipe and a file Sintassi: tee [-a] file_names Opzioni: "-a" append to the existing file instead of overwrite Exampe: find . -atime +30 | tess file.old.txt -----------------------------------------------------------------------

telinit

-----------------------------------------------------------------------

telnet

Really don't know this ??? -----------------------------------------------------------------------

test

test is used in shell script to evaluate a condition. It return 0 for TRUE or 1 for FALSE Sintassi: test < condition > Conditions: -e < file > File exist -b < file > File is a block device -c < file > File is a char device -d < file > File is a directory -f < file > File is normal -L < file > File is a symlink -p < file > File is a named-pipe -S < file > File is a socket -t [ ] File descriptor is open on the terminal -g < file > File has SGID bit set -u < file > File has SUID bit set -k < file > File has "sticky" bit set -r < file > File is readable -w < file > File is writable -x < file > File can be executed -O < file > File is owned by the current user UID -G < file > File is owned by the current user group GID -s < file > Filesize is greater than 0 -nt First file is newer than second -ot First file is older thant second -et Files are the same (hard-link) -z String is NULL -n String is not NULL == Strings are equal != Strings are different < First string come first > Second string come first -eq Equals -ne Different -lt Lower than -le Lower or equal of -gt Greater than -ge Greater or equal of ! Negation -a AND -o OR -----------------------------------------------------------------------

tic

-----------------------------------------------------------------------

time

Display the duration of a command -----------------------------------------------------------------------

times

Emette i tempi di utilizzo accumulati. -----------------------------------------------------------------------

tload

-----------------------------------------------------------------------

toe

-----------------------------------------------------------------------

top

Display the list of the system process and also let you manage them interactively Sintassi: top [options] Opzioni: -d Delay in seconds between updates -s Disable some commands, this is used to let top stay on a separated tty -i View "zombie" process -c View the command-line instad of only the command name Commands: q Quit top h Show top commands -----------------------------------------------------------------------

touch

Cambia la data-ora di accesso e di aggiornamento dei file. Se non viene specificata una data, viene utilizzata la data nel momento in cui viene eseguito il comando. Se il file specificato non esistone, allora viene crato vuoto. Sintassi: touch [-a] [-c] [-m] [date] < files_name > Opzioni: "-a" Viene cambiata solo la data di accesso. "-c" Non vengono creati i file che non esistono. "-m" Cambia solo la data di aggiornamento. "-r " Riproduce gli stessi dati del file indicato. "-t [[ ] [. ]]" Usa la data in argomento invece della data corrente. -----------------------------------------------------------------------

tput

-----------------------------------------------------------------------

traceroute

-----------------------------------------------------------------------

trap

"trap" a signal executing a command when this happen Sintassi: trap [-l] [command] [signal] Esempi: $ trap 'ls -l' SIGUSR1 Se la shell riceve un segnale SIGUSR1 esegue ls -l. $ trap '' SIGUSR1 La shell e tutti i processi figli ignorano il segnale SIGUSR1. $ trap - Tutti i segnali specificati sono riportati al loro valore originale $ trap 'echo "bye." EXIT Il comando viene eseguito all'uscita della shell quando il segnale e' EXIT -----------------------------------------------------------------------

tree

-----------------------------------------------------------------------

troff

-----------------------------------------------------------------------

true

-----------------------------------------------------------------------

tset

-----------------------------------------------------------------------

tty

Display the name of the terminal you are current using -----------------------------------------------------------------------

type

-----------------------------------------------------------------------

tune2fs


* U *
-----------------------------------------------------------------------

udosctl

-----------------------------------------------------------------------

ulimit

Permette di controllare le risorse disponibili dalla shell ed i suoi processi. Sintassi: ulimit [ options ] [ limite ] Opzioni: "-H" Imposta il limite hard per la data risorsa. "-S" Imposta il limite soft per la data risorsa. "-a" Sono riportati tutti i limiti correnti. "-c" La grandezza massima dei file core creati. "-d" La grandezza massima del segmento dati di un processo. "-f" La grandezza massima dei file creati dalla shell. "-m" La grandezza massima della memoria occupata. "-s" La grandezza massima dello stack. "-t" Il massimo quantitativo di tempo di CPU in secondi. "-p" La grandezza della pipe in blocchi da 512 byte "-n" Il numero massimo di descrittori di file aperti "-u" Il numero massimo di processi disponibili per un singolo user. "-v" Il massimo ammontare di memoria virtuale disponibile per la shell. -----------------------------------------------------------------------

umask

Modifica la maschera di creazione dei file dell'user. Di solito si usa il valore 022 Sintassi: umask [-S] [ modalità ] Opzioni: "-S" viene emesso il valore corrente della maschera -----------------------------------------------------------------------

umount

Smonta i filesystems Sintassi: umount [ options ] [ device ] [ directory ] Esempi: umount /floppy Dismount the FS mounted under /floppy umount /dev/fd0 Dismount the floppy Opzioni: "-a" Vengono smontati tutti i filesystem indicati in /etc/fstab. "-t [no] [,...]" Indica che l'azione deve essere eseguita solo sui filesystem specificati. Se si usa il prefisso no, l'azione si deve compiere su tutti i filesystem a esclusione di quelli indicati. -----------------------------------------------------------------------

umsmanifest

-----------------------------------------------------------------------

umssetup

-----------------------------------------------------------------------

umssync

-----------------------------------------------------------------------

unalias

Rimuove l'alias indicato dalla lista degli alias definiti. Se viene fornita l'opzione -a, sono rimosse tutte le definizioni di alias. Sintassi: unalias [-a] [nome-di-alias ... ] -----------------------------------------------------------------------

uname

Tell wich system you are running Sintassi: uname [-s] [-a] "-s" view only the system name "-a" view more -----------------------------------------------------------------------

uncompress -> compress

Decompress a ".Z" file Sintassi: uncompress [-c] "-c" view the compressed files without converting it -----------------------------------------------------------------------

unexpand

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uniq

Remove lines from a text files -----------------------------------------------------------------------

unpack

Unpack a file ".z" -----------------------------------------------------------------------

uptime

Tell from how many time a system is ON ... this can be a value of different years. -----------------------------------------------------------------------

unzip

-----------------------------------------------------------------------

unzipsfx

-----------------------------------------------------------------------

update

Con questo nome, update, viene avviato il daemon che si occupa di richiedere periodicamente al kernel lo scarico della memoria cache. Sintassi: update [ options ] -----------------------------------------------------------------------

useradd

Il programma useradd permette di aggiungere un nuovo utente in un sistema in cui siano attive, o meno, le password shadow. Sintassi: useradd -D [ options ] -----------------------------------------------------------------------

userdel

userdel permette di eliminare un account utente Sintassi: userdel [-r] user "-r" elimina anche la directory home dell'user eliminato -----------------------------------------------------------------------

usermod

Permette di modificare alcune caratteristiche di un account utente. Sintassi: usermod [ options ] user -----------------------------------------------------------------------

users

Visualizza i nomi degli utenti attualmente collegati. users [ file ] -----------------------------------------------------------------------

uuencode/uudecode

Encode/Decode a text file in order to sent him by mail with the MIME type -----------------------------------------------------------------------

uugetty

uugetty si comporta in modo analogo a getty (con la stessa sintassi e le stesse options), con la differenza fondamentale che utilizza lo stesso sistema di file di lock usati dai programmi uucp. In pratica uugetty viene usato tutte le volte che entra in gioco il modem. Sintassi: uugetty [ options ] [ [ ] ] -----------------------------------------------------------------------


* V *
-----------------------------------------------------------------------

vacation

Reply to all the incoming mail message telling that you are in holyday -----------------------------------------------------------------------

vdir

-----------------------------------------------------------------------

vile

-----------------------------------------------------------------------

vi

The classic Unix text editor -----------------------------------------------------------------------

 


* W *
-----------------------------------------------------------------------

w

Visualizza i nomi degli utenti che accedono attualmente e varie informazioni sulla loro attività. -----------------------------------------------------------------------

wait

Attende la conclusione del processo specificato e restituisce il suo stato di uscita. Sintassi: wait [n] -----------------------------------------------------------------------

wc

Count char, word into a files -----------------------------------------------------------------------

whatis

Search into the 'whatis' database, that contain info about the command system, for one or more words. The 'whatis' database is generated thru' the command 'makewhatis' -----------------------------------------------------------------------

whereis

Localizza i file binari, i sorgenti e le pagine di manuale dei file specificati nell'argument. Sintassi: whereis [ options ] < file > -----------------------------------------------------------------------

which

Simula la ricerca che farebbe la shell per avviare i programmi indicati negli argomenti e determina la posizione di quelli che verrebbero scelti. Sintassi: which ... -----------------------------------------------------------------------

who

Tell who is using a computer Sintassi: who [ options ] [< file >] [am i] -----------------------------------------------------------------------

whoami

Visualizza il nome dell'account utente che si sta' utilizzando. E' equivalente a id -un. -----------------------------------------------------------------------

write

Write a message on the screen of nother user


* Y *
-----------------------------------------------------------------------

yes

A strange program used for testing, it print continuosly a letter "y" on a new line. Use CTRL+C or the kill command to stop it -----------------------------------------------------------------------

ypdomainname -> hostname


* Z *
-----------------------------------------------------------------------

zcat

zcat come programma autonomo non esiste: è un link a gzip. Se gzip viene avviato con il nome zcat si comporta come se fosse stata utilizzata l'opzione -c. Il link verso gzip può essere sia simbolico che non. -----------------------------------------------------------------------

zip

-----------------------------------------------------------------------

zipnote

-----------------------------------------------------------------------

zipsplit

------------------------------------------------------------------

Comandi Base

  • pwd : vous indique le répertoire courant
  • mkdir : crée un répertoire. Ex: mkdir /volume1/web/test crée le sous-répertoire test sous les répertoires
  • cd : change de répertoire courant. Exemples :
    • cd .. : remonte d'un niveau supérieur
    • cd /volume1/web : se déplace directement dans /volume1/web
    • cd test : descend dans le sous-répertoire, du répertoire courant (/volume1/web)
    • cd . : va dans le répertoire courant
    • cd ~ : va dans le répertoire home
  • ls : liste le contenu d'un répertoire sans donner de détails sur les fichiers
  • ls -al : liste le contenu d'un répertoire, avec tous les détails, y compris les fichiers cachés (commençant par .)
  • cp : copie un fichier. Ex: cp /volume1/web/index.php /volume1/public/index.php (index php est copié de web à public)
  • mv : déplace un fichier. Ex: mv /volume1/web/index.php /volume1/public/index.php (index php est déplacé de web à public)
  • rm : supprime un fichier. Ex: rm /volume1/web/index.php
  • rm -rf : supprime un répertoire et son contenu. Ex: rm -rf /volume1/web/test
  • find : trouve un fichier. Ex: find / -name index.php cherche tous les fichiers index.php à partir de la racine
  • ps : liste tous les processus en cours d'exécution.
  • ps | grep apache : liste tous les processus, pipe le résultat (envoie le résultat) dans grep qui sélectionne les lignes où apparaît apache.