List of Unix programs

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List of Unix programs

This is a list of UNIX

Unix

Unix is a computer operating system originally developed in 1969 by a group of American Telephone & Telegraph employees at Bell Labs, including Ken Thompson , Dennis Ritchie, Douglas McIlroy, and Joe Ossanna....
utilities as specified by IEEE Std 1003.1-2004, which is part of the Single UNIX Specification

Single UNIX Specification

The Single UNIX Specification is the collective name of a family of standards for computer operating systems to qualify for the name "Unix". The SUS is developed and maintained by the Austin Group, based on earlier work by the IEEE and The Open Group....
(SUS).

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This is a list of UNIX

Unix

Single UNIX Specification

Unix-like

A Unix-like operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification....
operating systems.

List

IEEE Std 1003.1-2001 utilities
Name	Category	Description	First appeared
admin	SCCS Source Code Control System Source Code Control System was the first source code revision control system. It was originally developed at Bell Labs in 1972 by Marc J. Rochkind for an IBM System/370 computer running MVT....	Create and administer SCCS Source Code Control System Source Code Control System was the first source code revision control system. It was originally developed at Bell Labs in 1972 by Marc J. Rochkind for an IBM System/370 computer running MVT.... files
alias	Misc	Define or display aliases
ar Ar (Unix) The archiver is a Unix utility that maintains groups of files as a single File archiver. Today, ar is generally used only to create and update static library files that the link editor or linker uses; it can be used to create archives for any purpose, but has been largely replaced by tar for purposes other than static libraries....	Misc	Create and maintain library archives
asa	Text Processing	Interpret carriage-control characters
at At (Unix) In Unix-like computer operating systems,the at commandis used to schedule command s to be executed once, at a particular system time in the future....	Process Management	Execute commands at a later time	Version 7 AT&T UNIX
awk AWK (programming language) AWK is a programming language that is designed for processing text-based data, either in files or data streams, and was created at Bell Labs in the 1970s....	Text processing	Pattern scanning and processing language	Version 7 AT&T UNIX
basename Basename basename is a standard UNIX computer program, when basename is given a pathname, it will delete any prefix up to the last slash character and return the result....	Filesystem	Return non-directory portion of a pathname
batch	Process Management	Schedule commands to be executed in a batch queue
bc Bc programming language bc is "an arbitrary precision calculator language" with syntax similar to the C . It is generally used by typing the command bc on a Unix command prompt and entering a mathematical expression, such as * 2, whereupon 8 will be output....	Misc	Arbitrary-precision arithmetic Arbitrary-precision arithmetic In computer science, arbitrary-precision arithmetic, also called bignum arithmetic, is a technique whereby computer programs perform calculations on integers or rational numbers with an arbitrary number of numerical digits of precision , typically limited only by the available memory of the host system.... language
bg Bg (Unix) bg is a Unix command to run a job asynchronous list in the background. bg identifies jobs using the job-id. bg will also resume a suspended job....	Process Management	Run jobs in the background
break	Shell programming	Exit from for For loop In computer science a for loop is a programming language statement which allows code to be repeatedly execution . A for loop is classified as an iteration statement.... , while While loop In most computer programming languages, a while loop is a Control flow statement that allows code to be executed repeatedly based on a given Boolean datatype condition.... , or until Until Until may refer toControl flow's use as a computer programming language's control flow constructionUntil..., the song from the film Kate & Leopold... loop Control flow In computer science control flow refers to the order in which the individual statement , Instruction or function calls of an imperative programming or functional programming computer program are execution or evaluated....
c99	C Programming	Compile Compiler A compiler is a computer program that transforms source code written in a programming language into another computer language . The most common reason for wanting to transform source code is to create an executable program.... standard C C (programming language) C is a general-purpose computer programming language originally developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories to implement the Unix operating system.... programs
cal Cal (Unix) is a standard program on Unix that prints an ASCII calendar of the given month or year. If the user does not specify any options, cal will print a calendar of the current month....	Misc	Print a calendar	Version 5 AT&T UNIX
cat Cat (Unix) The cat command is a standard Unix program used to Concatenation and display files. The name is from :wikt:catenate, a synonym of concatenate....	Filesystem	Concatenate and print files	Version 1 AT&T UNIX
cd	Filesystem	Change the working directory
cflow	C Programming	Generate a C-language flowgraph
chgrp Chgrp The chgrp command is used by Privilege users on Unix-like systems to change the group associated with a file. Unlike the chown command, chgrp allows regular users to change groups, but only to one of which they are a member....	Filesystem	Change the file group ownership
chmod Chmod The chmod command is a UNIX shell command in Unix and Unix-like environments. When executed, the command can change file system modes of Computer file and directory ....	Filesystem	Change the file modes/attributes/permissions	Version 1 AT&T UNIX
chown Chown The chown command is used on Unix-like systems to change the owner of a file. In most implementations, it can only be executed by the superuser....	Filesystem	Change the file ownership	Version 1 AT&T UNIX
cksum Cksum cksum is a POSIX command that reads the files specified by the File parameter and calculates a checksum, cyclic redundancy check and the byte count for a file or files....	Filesystem	Write file checksums and sizes	4.4BSD
cmp	Filesystem	Compare two files	Version 1 AT&T UNIX
colon	Shell Programming	Null utility
comm Comm The comm command in Unix is a utility that is used to compare two computer file for common and distinct lines. Comm is specified in the POSIX standard....	Text Processing	Select or reject lines common to two files	Version 4 AT&T UNIX
command	Shell Programming	Execute a simple command
compress Compress compress is a Unix compression program based on the LZC compression method, which is an LZW implementation using variable size pointers as in LZ78....	Filesystem	Compress data	4.3BSD
continue	Shell programming	Continue for For loop In computer science a for loop is a programming language statement which allows code to be repeatedly execution . A for loop is classified as an iteration statement.... , while While loop In most computer programming languages, a while loop is a Control flow statement that allows code to be executed repeatedly based on a given Boolean datatype condition.... , or until Until Until may refer toControl flow's use as a computer programming language's control flow constructionUntil..., the song from the film Kate & Leopold... loop Control flow In computer science control flow refers to the order in which the individual statement , Instruction or function calls of an imperative programming or functional programming computer program are execution or evaluated....
cp Cp (Unix) cp is the command entered in a Unix shell to copy a computer file from one place to another, possibly on a different filesystem. The original file remains unchanged, and the new file may have the same or a different name....	Filesystem	Copy files	Version 1 AT&T UNIX
crontab	Misc	Schedule periodic background work
csplit	Text Processing	Split files based on context	PWB UNIX
ctags Ctags Ctags is a program that generates an index file of names found in source and header files of various programming languages.Depending on the language,...	C Programming	Create a tags file	3.0BSD
cut Cut (Unix) In computing, cut is a Unix command line utility which is used to extract sections from each line of input ? usually from a computer file.Extraction of line segments can typically be done by bytes , character s , or fields separated by a delimiter ....	Shell Programming	Cut out selected fields of each line of a file
cxref	C Programming	Generate a C-language C (programming language) C is a general-purpose computer programming language originally developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories to implement the Unix operating system.... program cross-reference table
date Date (Unix) The Unix date command displays the time and date. The super-user can use it to set the system clock....	Misc	Write the date and time	Version 1 AT&T UNIX
dd Dd (Unix) dd is a common UNIX program whose primary purpose is the low-level copying and conversion of raw data. dd is an abbreviation for "data definition" in IBM Job Control Language, and the command's syntax is meant to be reminiscent of this....	Filesystem	Convert and copy a file
delta	SCCS	Make a delta (change) to an SCCS file
df Df (Unix) df is a standard Unix computer program used to display the amount of available disk space for filesystems on which the invoking user has appropriate read access....	Filesystem	Report free disk space	Version 1 AT&T UNIX
diff Diff In computing, diff is a file comparison utility that outputs the differences between two files, or the changes made to a current file by comparing it to a former version of the same file....	Text processing	Compare two files
dirname Dirname dirname is a standard UNIX computer program, when dirname is given a pathname, it will delete any suffix beginning with the last slash character and return the result....	Filesystem	Return the directory portion of a pathname
dot	Shell programming	Execute commands in the current environment
du Du (Unix) du is a standard Unix computer program used to estimate the file space usage; space used under a particular directory or files on a file system....	Filesystem	Estimate file space usage	Version 1 AT&T UNIX
echo	Shell programming	Write arguments to standard output
ed Ed (text editor) ed is a standard text editor on the Unix operating system. ed was originally written by Ken Thompson and contains one of the first implementations of regular expressions....	Text processing	The standard text editor	Version 1 AT&T UNIX
env	Misc	Set the environment for command invocation
eval Eval In some programming languages, eval is a subroutine which evaluates a string as though it were an expression and returns a result; in others, it executes multiple lines of code as though they had been included instead of the line including the eval....	Shell programming	Construct command by concatenating arguments
ex	Text processing	Text editor	BSD
exec Exec (operating system) The exec functions of Unix-like operating systems are a collection of functions that causes the running process to be completely replaced by the program passed as argument to the function....	Shell programming	Execute commands and open, close, or copy file descriptors
exit Exit (command) exit is a command used in many operating system command line Operating system shell. Entering the command logs the user out of their current session, or closes the user's current computer console or computer terminal connection....	Shell programming	Cause the shell to exit
expand Expand (Unix) expand is a command in the Unix. It is used to convert groups of tabs into space character s.For example: $ echo -e " foo" \| expand \| od -c...	Text Processing	Convert tabs to spaces	3.0BSD
export Environment variable Environment variables are a set of dynamic named Value s that can affect the way running computer process will behave on a computer....	Misc	Set the export attribute for variables
expr Expr expr is a command line interface Unix utility which evaluates an expression and outputs the corresponding value.Syntax: expr expr evaluates integer or String expressions, including pattern matching regular expressions....	Shell Programming	Evaluate arguments as an expression
false False (Unix) In Unix-like operating systems, false is the command that always returns the value 1, which is regarded by the shell as the logical value false....	Shell programming	Return false value
fc Fc (Unix) is a standard program on Unix that lists or edits and reexecutes, commands previously entered to an interactive shell....	Misc	Process the command history list
fg Fg (Unix) fg is a Unix job control command that resumes the execution of a suspended Process in the foreground execution with its standard input and output streams redirected to the user's computer terminal....	Process Management	Run jobs in the foreground
file File (Unix) file is a standard Unix computer program for determining the type of data contained in a computer file....	Filesystem	Determine file type	Version 4 AT&T UNIX
find Find The find program is a directory Search_engine_ on Unix-like platforms. It searches through one or more directory tree of a filesystem, locating Computer files based on some user-specified criteria....	Filesystem	Find files	Version 1 AT&T UNIX
fold	Text processing	Filter for folding lines
fort77	C Programming	FORTRAN Fortran Fortran is a general-purpose programming language, procedural programming language, imperative programming language programming language that is especially suited to numerical analysis and scientific computing.... compiler
fuser Fuser (Unix) fuser is a UNIX command used to show which process es are using a specified file , file system, or socket. For example: # fuser -m -u /mnt/usb1...	Process Management	List process IDs Process identifier In computing, the process identifier is a number used by some operating system kernel s to uniquely identify a computer process.In Unix-like operating systems, the PID of a newly created child process is returned by the Fork system call to the parent process.... of all processes that have one or more files open
gencat	Misc	Generate a formatted message catalog
get	SCCS	Get a version of an SCCS file
getconf	Misc	Get configuration values
getopts Getopts getopts is a common tool which programmers can use to process command-line arguments. It originated in the UNIX shell environment, where it could be invoked from shell scripts....	Shell Programming	Parse utility options
grep Grep grep is a command line interface text search utility originally written for Unix. The name is taken from the first letters in global / regular expression / print, a series of instructions for the ed text editor....	Misc	Search text for a pattern
hash Hash (Unix) hash is a Unix command that prints the location information for the commands found....	Misc	Remember or report utility locations
head Head (Unix) head is a Computer program on Unix and Unix-like systems used to display the first few lines of a text Computer file or pipe d data. The command syntax is:...	Text processing	Copy the first part of files	PWB UNIX
iconv Iconv iconv is a computer program and a standardized Application programming interface used to convert between different character encodings....	Text processing	Codeset conversion
id Id (Unix) In computer software, id is a program in Unix-like operating systems that prints the User identifier of the account of which the program is executed by....	Misc	Return user identity	4.4BSD
ipcrm Ipcrm The ipcrm command will mark System Vinterprocess communication API Kernel entities for removal,deferred until the last connected process detaches....	Misc	Remove a message queue, semaphore set, or shared memory segment identifier
ipcs Ipcs The ipcs command will list System Vinterprocess communication API Kernel entities to Standard streams.System V IPC kernel entities are:...	Misc	Report interprocess communication facilities status
jobs	Process Management	Display status of jobs in the current session
join Join (Unix) join is a command in Unix-like operating systems that merges the lines of two sorted text files based on the presence of a common Field ....	Text Processing	Relational database Relational database A relational database is a database that groups data using common attributes found in the data set. The resulting "clumps" of organized data are much easier for people to understand.... operator
kill Kill (Unix) In computing, kill is an operating system command that is used to request the termination of a process that is currently running on the system....	Process Management	Terminate or signal processes	Version 3 AT&T UNIX
lex Lex programming tool In computer science, lex is a Computer program that generates lexical analysiss . Lex is commonly used with the yacc parser generator. Lex, originally written by Eric Schmidt and Mike Lesk, is the standard lexical analyzer generator on many Unix systems, and a tool exhibiting its behavior is specified as part of the POSIX standard....	C Programming	Generate programs for lexical tasks
link Link (Unix) The link utility is a Unix command line program that creates a Hard_link from an existing directory entry to a new directory entry. It does no more than call the link system function....	Filesystem	Call link function	Version 1 AT&T UNIX
ln Ln (Unix) ln is a standard Unix command used to create links to files....	Filesystem	Link files	Version 1 AT&T UNIX
locale Locale In computing, locale is a set of parameters that defines the user's language, country and any special variant preferences that the user wants to see in their user interface....	Misc	Get locale-specific information
localedef	Misc	Define locale environment
logger	Shell programming	Log messages
logname Logname In computer software, logname is a program in Unix and Unix-like operating systems that prints the name of the user executing the command . It corresponds to the LOGNAME variable in the system-state environment....	Misc	Return the user's login name	4.4BSD
lp Lp (Unix) The lp command is used on many Unix-like systems to assign jobs to printer queues. The name derives from "lineprinter", though it has become the commonly used command for any sort of printer....	Text Processing	Send files to a printer
ls Ls In computing, ls is a command to list files in Unix and Unix-like operating systems. ls is specified by POSIX and the Single UNIX Specification....	Filesystem	List directory contents	Version 1 AT&T UNIX
m4 M4 (computer language) m4 is a general purpose macro processor designed by Brian Kernighan and Dennis Ritchie. The name m4 stands for macro, i.e. m plus 4 characters....	Misc	Macro processor	PWB UNIX
mailx Mailx mailx is a Unix utility program for sending and receiving mail, also known as a Mail User Agent program. It is an improved version of the mail utility....	Misc	Process messages	Version 1 AT&T UNIX
make	Programming	Maintain, update, and regenerate groups of programs
man Manual page (Unix) Almost all substantial Unix and Unix-like operating systems have extensive documentation known as man pages . The Unix command used to display them is man....	Misc	Display system documentation
mesg Mesg mesg is a Unix command that sets or reports the permission other users have to write to your terminal using the Talk and Write commands....	Misc	Permit or deny messages	Version 1 AT&T UNIX
mkdir Mkdir The mkdir command in the Unix, DOS, OS/2 and Microsoft Windows operating systems is used to make a new directory . In DOS, OS/2 and Windows the command is often abbreviated to md....	Filesystem	Make directories	Version 1 AT&T UNIX
mkfifo	Filesystem	Make FIFO FIFO FIFO is an acronym for First In, First Out, an abstraction in ways of organizing and manipulation of data relative to time and prioritization.... special files	4.4BSD
more	Text processing	Display files on a page-by-page basis
mv MV MV can stand for:...	Filesystem	Move files	Version 1 AT&T UNIX
newgrp	Misc	Change to a new group	Version 6 AT&T UNIX
nice Nice (Unix) nice is a program found on Unix and Unix-like operating systems such as Linux. nice directly maps to a Kernel call of the same name....	Process Management	Invoke a utility with an altered nice value	Version 4 AT&T UNIX
nl Nl (Unix) nl is a Unix utility for numbering lines, either from a file or from standard input, reproducing output on standard output.It has a number of switches:...	Text Processing	Line numbering filter
nm Nm (Unix) The nm command ships with a number of later versions of Unix and similar operating systems. nm is used to examine binary files and to display the contents of those files, or Metadata stored in them, specifically the symbol table....	C Programming	Write the name list of an object file Object file In computer science, object code, or an object file, is the representation of code that a compiler or assembler generates by processing a source code file....
nohup Nohup nohup is a Unix command that is used to run another command while suppressing the action of the SIGHUP signal, enabling the command to keep running after the user who issues the command has logged out....	Process Management	Invoke a utility immune to hangups SIGHUP SIGHUP is a Signal used on POSIX-compliant platforms, originally designed to notify Process of a RS-232 drop. SIGHUP is a C preprocessor defined in the header file signal.h....
od Od (Unix) od is an octal dumping program for Unix and Unix-like systems. It can also dump hexadecimal or decimal data.od is one of the earliest Unix programs, having appeared in version 1 AT&T Unix....	Misc	Dump files in various formats	Version 1 AT&T UNIX
paste Paste (Unix) paste is a Unix command line utility which is used to join files horizontally by outputting lines consisting of the sequentially corresponding lines of each file specified, separated by tabs, to the standard output....	Text processing	Merge corresponding or subsequent lines of files	Version 32V AT&T UNIX
patch Patch (Unix) patch is a Unix computer program that updates text files according to instructions contained in a separate file, called a patch file. The patch file is a text file that consists of a list of differences and is produced by running the related diff program with the original and updated file as arguments....	Text processing	Apply changes to files
pathchk	Filesystem	Check pathnames
pax	Misc	Portable archive interchange	4.4BSD
pr	Text processing	Print files	Version 1 AT&T UNIX
printf	Shell programming	Write formatted output	4.3BSD-Reno
prs PRS PRS may stand for:...	SCCS	Print an SCCS file
ps Ps (Unix) In most Unix-like operating systems, the ps program displays the currently-running process . A related Unix utility named Top provides a real-time view of the running processes....	Process Management	Report process status	Version 4 AT&T UNIX
pwd Pwd In Unix-like and some other operating systems the pwd command is used to output the path of the current working directory.The command is a shell builtin in certain Unix shells such as Bourne shell, and Bourne-Again shell....	Filesystem	print working directory - Return working directory name
qalter	Batch Utilities	Alter batch job
qdel	Batch Utilities	Delete batch jobs
qhold	Batch Utilities	Hold batch jobs
qmove	Batch Utilities	Move batch jobs
qmsg	Batch Utilities	Send message to batch jobs
qrerun	Batch Utilities	Rerun batch jobs
qrls	Batch Utilities	Release batch jobs
qselect	Batch Utilities	Select batch jobs
qsig QSIG QSIG is an Integrated Services Digital Network based signaling protocol for signaling between private branch exchanges in a Private Integrated Services Network ....	Batch Utilities	Signal batch jobs
qstat	Batch Utilities	Show status of batch jobs
qsub	Batch Utilities	Submit a script
read	Shell Programming	Read a line from standard input
readonly	Misc	Set the readonly attribute for variables
renice	Process Management	Set nice values of running processes	4.0BSD
return	Shell Programming	Return from a function
rm Rm (Unix) rm is a Unix command used to delete files from a filesystem....	Filesystem	Remove directory entries	Version 1 AT&T UNIX
rmdel	SCCS	Remove a delta from an SCCS file
rmdir Rmdir rmdir is a command which will remove an empty directory on a Unix, DOS, OS/2 or Microsoft Windows operating system. In Unix, it cannot be capitalized, whereas this doesn't apply for DOS, OS/2 and Windows....	Filesystem	Remove directories	Version 1 AT&T UNIX
sact	SCCS	Print current SCCS file-editing activity
sccs	SCCS Source Code Control System Source Code Control System was the first source code revision control system. It was originally developed at Bell Labs in 1972 by Marc J. Rochkind for an IBM System/370 computer running MVT....	Front end for the SCCS subsystem
sed Sed sed is a Unix utility which parses text files and implements a programming language which can apply textual transformations to such files. It reads input files line by line , applying the operation which has been specified via the command line , and then outputs the line....	Text processing	Stream editor	Version 7 AT&T UNIX
set	Misc	Set or unset options and positional parameters
sh Bourne shell The Bourne shell, or sh, was the default Unix shell of Version 7 Unix, and replaced the Thompson shell, whose executable file had the same name, sh....	Shell programming	Shell Shell (computing) In computing, a shell is a piece of software that provides an Interface for users. Typically, the term refers to an operating system shell which provides access to the services of a kernel .... , the standard command language interpreter	Version 7 AT&T UNIX
shift	Shell programming	Shift positional parameters
sleep Sleep (Unix) sleep is a Unix command line program that sleep program execution for a specified period of time.The sleep instruction suspends the calling process for at least the specified number of seconds , minutes, hours or days....	Shell programming	Suspend execution for an interval	Version 4 AT&T UNIX
sort Sort (Unix) Sort is a standard Unix command line program that prints the lines of its input or concatenation of all files listed in its argument list in sorted order....	Text Processing	Sort, merge, or sequence check text files
split Split (Unix) split is a Unix utility most commonly used to split a Computer file into two or more smaller files....	Misc	Split files into pieces	Version 3 AT&T UNIX
strings Strings (Unix) In computer software, strings is a program in Unix-like operating systems that finds and prints text string embedded in binary files such as executables....	C Programming	Find printable strings in files
strip Strip (Unix) In Unix and Unix-like operating systems, the strip program removes unnecessary information from executable binary programs and object files, thus potentially resulting in better performance and sometimes significantly less disk space usage....	C Programming	Remove unnecessary information from executable files
stty	Misc	Set the options for a terminal
tabs	Misc	Set terminal tabs	PWB UNIX
tail Tail (Unix) tail is a Computer program on Unix and Unix-like systems used to display the last few lines of a text Computer file or pipe d data.Syntax...	Text processing	Copy the last part of a file	PWB UNIX
talk Talk (Unix) talk was a program originally used for instant messenger between different users of a single multi-user computer running the Unix operating system....	Misc	Talk to another user	4.2BSD
tee	Shell programming	Duplicate standard input
test Test (Unix) test is a Unix command that evaluates conditional expressions....	Shell programming	Evaluate expression Expression (programming) An expression in a programming language is a combination of value s, variables, operator s, and function s that are interpreted according to the particular Order of operations and of association for a particular programming language, which computes and then produces another value....
time Time (Unix) time is a command in the Unix operating systems. It is used to determine the duration of execution of a particular command ....	Process Management	Time a simple command	Version 3 AT&T UNIX
times	Process Management	Write process times
touch Touch (Unix) touch is a standard Unix computer program used to change a computer file's access and modification system time. It is also used to create a new empty file....	Filesystem	Change file access and modification times	Version 7 AT&T UNIX
tput Tput In computing, tput is a standard Unix operating system command which is used to set computer terminal features.Depending on the system, tput uses the terminfo or termcap database, as well as looking into the environment variable for the terminal type....	Misc	Change terminal Terminal Terminal may mean:... characteristics	System V
tr Tr (Unix) tr is a command in Unix-like operating systems.When executed, the program reads from the standard input and writes to the standard output. It takes as Command-line argument two sets of characters, and replaces occurrences of the characters in the first set with the corresponding elements from the other set....	Text processing	Translate characters	Version 4 AT&T UNIX
trap	Process Management	Trap signals
true True (Unix) In Unix-like operating systems, true is a command whose only function is to always return the value 0, which is regarded by the shell as the logical value true....	Shell programming	Return true value
tsort Tsort (Unix) tsort is a command line interface utility initially written for use with the Unix operating system, that performs a Topological sorting on the standard input....	Text processing	Topological sort	Version 7 AT&T UNIX
tty Tty (Unix) tty is a Unix Command that prints to Standard streams the name of the file connected to standard input. The name of the program comes from Teleprinter, abbreviated "TTY"....	Misc	Return user's terminal Terminal Terminal may mean:... name	Version 1 AT&T UNIX
type Type (Unix) type is a Unix command that displays how a name would be interpreted if used as a command....	Misc	Displays how a name would be interpreted if used as a command
ulimit	Misc	Set or report file size limit
umask Umask umask is a Command and a Function in POSIX environments which sets the default permission modes for newly created files and directories of the current process....	Misc	Get or set the file mode creation mask
unalias	Misc	Remove alias definitions
uname Uname uname is a software program in Unix and Unix-like computer operating systems that prints the name, version and other details about the current machine and the operating system running on it....	Misc	Return system name	PWB UNIX
uncompress Uncompress uncompress is a UNIX shell command in Unix-like environments.The uncompress utility will restore files to their original state after they have been compressed using the compress utility....	Misc	Expand compressed data	4.3BSD
unexpand Unexpand unexpand is a command in the Unix. It is used to convert groups of space character s into tabs.For example: $ echo " asdf sdf" \| unexpand \| od -c...	Text Processing	Convert spaces to tabs	3.0BSD
unget	SCCS	Undo a previous get of an SCCS file
uniq Uniq uniq is a Unix utility which, when fed a text file, outputs the file with adjacent identical lines collapsed to one. It is a kind of filter program....	Text Processing	Report or filter out repeated lines in a file	Version 3 AT&T UNIX
unlink Unlink (Unix) In Unix-like operating systems, unlink is a system call and a command line interface utility to delete files. The program directly interfaces the system call, which removes the file name and directories like Rm and rmdir....	Filesystem	Call the unlink function	Version 1 AT&T UNIX
unset Unset unset is a Unix Unix shell command. It unsets a shell variable, removing it from memory and the shell's exported Environment variable. It is implemented as a shell built-in, because it directly manipulates the internals of the shell....	Misc	Unset values and attributes of variables and functions
uucp UUCP UUCP is an abbreviation for Unix to Unix Copy Program. The term generally refers to a suite of computer programs and communications protocols allowing remote execution of commands and transfer of Computer files, email and netnews between computers....	Network	System-to-system copy
uudecode	Network	Decode a binary file	4.0BSD
uuencode Uuencode Uuencoding is a form of binary-to-text encoding that originated in the Unix program uuencode, for code Binary numeral system data for transmission over the uucp mail system....	Network	Encode a binary file	4.0BSD
uustat	Network	uucp UUCP UUCP is an abbreviation for Unix to Unix Copy Program. The term generally refers to a suite of computer programs and communications protocols allowing remote execution of commands and transfer of Computer files, email and netnews between computers.... status inquiry and job control
uux	Process Management	Remote command execution
val	SCCS	Validate SCCS files
vi Vi vi is a family of screen-oriented text editors which share common characteristics, such as methods of invocation from the operating system command interpreter, and characteristic user interface features....	Text processing	Screen-oriented (visual) display editor	BSD
wait	Process Management	Await process completion
wc Wc (Unix) wc is a command in Unix-like operating systems.The program reads either standard input or a list of files and generates one or more of the following statistics: number of bytes, word count, and number of lines ....	Text processing	Word, line, and byte or character count	Version 1 AT&T UNIX
what	SCCS	Identify SCCS files
who Who (Unix) The standard Unix command who displays a list of users who are currently logged into a computer.The who command is related to the command W , which provides the same information but also displays additional data and statistics....	System Administration	Display who is on the system	Version 1 AT&T UNIX
write Write (Unix) write can refer to several Unix commands. All known variations of write are used to write messages to another user. The most popular variation sends a message directly to another user's TTY...	Misc	Write to another user's terminal	Version 1 AT&T UNIX
xargs Xargs xargs is a command on Unix and most Unix-like operating systems. It is useful when one wants to pass a large number of arguments to a command. Until Linux kernel 2.6.23, arbitrarily long lists of parameters could not be passed to a command , so xargs will break the list of arguments into sublists small enough to be acceptable....	Shell Programming	Construct argument lists and invoke utility	PWB UNIX
yacc Yacc The computer program yacc is a parser generator developed by Stephen C. Johnson at AT&T for the Unix operating system. The name is an acronym for "Yet Another Compiler Compiler." It generates a parsing based on an Formal grammar written in a notation similar to Backus-Naur form....	C Programming	Yet another compiler Compiler A compiler is a computer program that transforms source code written in a programming language into another computer language . The most common reason for wanting to transform source code is to create an executable program.... compiler	PWB UNIX
zcat	Text Processing	Expand and concatenate data

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– configurable list of equivalent programs for *nix systems.
– explains the names of many Unix commands.

List of Unix programs

List

See also

External links