Summary of utilities

Utility	Description
`adduser`	creates new user
`alias`	define or display aliases
`ar`	maintain a library archive
`at`	execute commands at a specified time
`awk`	pattern scanning and processing language
`basename`	display non-directory part of filename
`batch`	execute commands when system load permits
`bc`	calculator
`bg`	run a job to the background
`break`	exit from `for`, `while` or `until` loop
`cat`	concatenate and print files to standard output
`cd`	change working directory
`chgrp`	change file group ownership
`chmod`	change file access privileges
`chown`	change file ownership
`cksum`	file checksum utility
`cmp`	compare two files
`comm`	select/reject lines common to two files
`command`	execute a simple command
`compress`	reduces file to compressed form
`continue`	continue `for`, `while` or `until` loop
`cp`	copy files
`crontab`	schedule periodic background work
`csplit`	split a file according to context
`ctags`	create a 'tags' file
`cut`	select columns or fields from each line of a file
`date`	display current time and date
`dd`	convert file format
`df`	display free disk space
`diff`	show differences between two files
`dirname`	display directory part of a pathname
`du`	display file space usage
`echo`	write arguments to standard output
`ed`	basic text editor
`env`	set environment for a command
`eval`	construct command by concatenating arguments
`exec`	execute command by replacing shell process
`exit`	cause the shell to exit
`expand`	replace tabs by spaces
`export`	set export attribute for a variable
`expr`	evaluate an arithmetic expression
`ex`	text editor (see `vi`)
`false`	returns 'false' value, exit status 1
`fc`	process command history list
`fdisk`	modifies disk partition table
`fg`	run a job to the foreground
`file`	describe file contents
`find`	find files
`fold`	fold lines
`getconf`	get configuration variables
`getopts`	parse options for a utility
`grep`	select lines matching regular expression
`gunzip`	uncompresses gzip file
`gzip`	reduces file to compressed form
`head`	show the first few lines of a file
`id`	display information about a user's identity
`jobs`	list the jobs in the current session
`join`	relational database operator
`kill`	send a signal to a process
`ln`	link files
`locale`	display information about the 'locale'
`localedef`	define the 'locale'
`logger`	log message for the system administrator
`logname`	display your login user name
`lp`	send files to a printer
`ls`	list files (directory contents)
`mailx`	process electronic mail messages
`make`	maintain and update groups of programs
`man`	display manual pages
`mesg`	allow or deny messages on your terminal
`mkdir`	create new directories
`mkfifo`	create a FIFO file
`more`	'pager'
`mv`	move files
`newgrp`	change your current group-id
`nice`	run a command with changed priority
`nm`	display name list of an object file
`nohup`	run a command immune to hangups
`od`	dump files in various formats
`passwd`	change login password
`paste`	merge corresponding lines of text files
`patch`	apply changes to files
`pathchk`	check pathname is valid
`pax`	file archiver and format translator
`perl`	'Practical Extraction and Report Language'
`pr`	a very basic formatter for text files
`printf`	write formatted output
`ps`	display information about processes
`pwd`	display working directory
`read`	read a line from standard input
`readonly`	set read-only attribute for variables
`renice`	change the priority of a running process
`return`	return from a function
`rm`	remove a file
`rmdir`	remove empty directories
`sed`	stream editor
`set`	set options and positional parameters
`sh`	the shell
`shift`	shift positional parameters
`shutdown`	close down processes and shut down machine
`sleep`	suspend execution for a time interval
`sort`	sort or merge text files
`split`	split a file into pieces
`ssh`	secure shell for remote login
`strings`	display printable strings in a file
`strip`	remove unnecessary data from executable files
`stty`	set terminal options
`tabs`	reset the tab positions
`tail`	show the last few lines of a file
`talk`	talk to another user
`tar`	file and directory archive tool
`tee`	duplicate standard input
`test`	evaluate expression
`time`	display execution time for a command
`touch`	change last modification time of a file
`tput`	change terminal characteristics
`tr`	translate characters
`trap`	intercept a signal
`true`	returns 'true' value, exit status 0
`tty`	display the terminal name
`umask`	change access privileges when files are created
`unalias`	remove alias definition
`uname`	display the system name
`unexpand`	replace spaces by tabs
`uniq`	filter out repeated lines
`unset`	unset options and positional parameters
`useradd`	creates new user
`userdel`	removes a user
`uudecode`	decode a file which was coded with `uuencode`
`uuencode`	encode a binary file
`vi`	full-screen text editor
`wait`	suspend process until completion of another process
`wc`	word, line and byte count
`who`	list who is using the system
`write`	write a message on another user's terminal
`ypmatch`	prints values from Network Information System
`xargs`	construct argument list and execute command