List of POSIX commands

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Name	Category	Status (Option code)	Description	First appeared
`admin`	SCCS	Optional (XSI)	Create and administerSCCS files	PWB UNIX
`alias`	Misc	Mandatory	Manage command aliases
`ar`	Misc	Mandatory	Managelibrary archives	Version 1 AT&T UNIX
`asa`	Text processing	Optional (FR)	Interpretcarriage-control characters	System V
`at`	Process management	Mandatory	Execute commands at a later time	Version 7 AT&T UNIX
`awk`	Text processing	Mandatory	Pattern scanning and processing language	Version 7 AT&T UNIX
`basename`	Filesystem	Mandatory	Report non-directory portion of a pathname	Version 7 AT&T UNIX
`batch`	Process management	Mandatory	Schedule commands to be executed in a batch queue
`bc`	Misc	Mandatory	Arbitrary-precision arithmetic calculator	Version 6 AT&T UNIX
`bg`	Process management	Optional (UP)	Move jobs to the background
`cc`	C programming	Optional (CD)	Compile C source code	IEEE Std 1003.1-2024
`cal`	Misc	Optional (XSI)	Print a calendar	Version 5 AT&T UNIX
`cat`	Filesystem	Mandatory	Concatenate and print files	PDP-7 UNIX
`cd`	Filesystem	Mandatory	Change the working directory	Version 6 AT&T UNIX
`cflow`	C programming	Optional (XSI)	Generate a C-languagecall graph	System V
`chgrp`	Filesystem	Mandatory	Change file group ownership	PWB UNIX
`chmod`	Filesystem	Mandatory	Change file modes/attributes/permissions	PDP-7 UNIX
`chown`	Filesystem	Mandatory	Change file ownership	PDP-7 UNIX
`cksum`	Filesystem	Mandatory	Report filechecksum and size	4.4BSD
`cmp`	Filesystem	Mandatory	Compare two files	Version 1 AT&T UNIX
`comm`	Text processing	Mandatory	Select or reject lines common to two files	Version 4 AT&T UNIX
`command`	Shell programming	Mandatory	Execute a simple command
`compress`	Filesystem	Optional (XSI)	Compress data	4.3BSD
`cp`	Filesystem	Mandatory	Copy files	PDP-7 UNIX
`cron`	Misc	Mandatory	Schedule periodic background work	System V
`csplit`	Text processing	Mandatory	Split files based on context	PWB UNIX
`ctags`	C programming	Optional (SD)	Create a tags file	3BSD
`cut`	Text processing	Mandatory	Cut out selected fields of each line of a file	System III
`cxref`	C programming	Optional (XSI)	Generate aC-language program cross-reference table	System V
`date`	Misc	Mandatory	Report or change system date and time	Version 1 AT&T UNIX
`dd`	Filesystem	Mandatory	Convert and copy files	Version 5 AT&T UNIX
`delta`	SCCS	Optional (XSI)	Make a delta (change) to an SCCS file	PWB UNIX
`df`	Filesystem	Mandatory	Report free storage space	Version 1 AT&T UNIX
`diff`	Text processing	Mandatory	Compare two files	Version 5 AT&T UNIX
`dirname`	Filesystem	Mandatory	Report the directory portion of a pathname	System III
`du`	Filesystem	Mandatory	Estimate file space usage	Version 1 AT&T UNIX
`echo`	Shell programming	Mandatory	Write to standard output	Version 2 AT&T UNIX
`ed`	Text processing	Mandatory	The standard text editor	PDP-7 UNIX
`env`	Misc	Mandatory	Set the environment for command invocation	System III
`ex`	Text processing	Optional (UP)	Text editor	1BSD
`expand`	Text processing	Mandatory	Convert tabs to spaces	3BSD
`expr`	Shell programming	Mandatory	Evaluate arguments as an expression	Version 7 AT&T UNIX
`false`	Shell programming	Mandatory	Exit immediately withstatus 1	Version 7 AT&T UNIX
`fc`	Misc	Optional (UP)	Process the command history list
`fg`	Process management	Optional (UP)	Move a job to the foreground
`file`	Filesystem	Mandatory	Report type of files	Version 4 AT&T UNIX
`find`	Filesystem	Mandatory	Find files	Version 1 AT&T UNIX
`fold`	Text processing	Mandatory	Filter for folding lines	1BSD
`fuser`	Process management	Optional (XSI)	Listprocess IDs of all processes that have one or more files open	System V
`gencat`	Misc	Mandatory	Generate a formatted message catalog
`get`	SCCS	Optional (XSI)	Get a version of an SCCS file	PWB UNIX
`getconf`	Misc	Mandatory	Get configuration values
`getopts`	Shell programming	Mandatory	Parse utility options
`gettext`	Misc	Mandatory	Retrieve text string from messages object
`grep`	Misc	Mandatory	Search text for a pattern	Version 4 AT&T UNIX
`hash`	Misc	Mandatory	Hash database access method
`head`	Text processing	Mandatory	Copy the first part of files	PWB UNIX^{[citation needed]}
`iconv`	Text processing	Mandatory	Codeset conversion	HP-UX
`id`	Misc	Mandatory	Report user identity	System V
`ipcrm`	Misc	Optional (XSI)	Remove a message queue, semaphore set, or shared memory segment identifier	System V
`ipcs`	Misc	Optional (XSI)	Report interprocess communication facilities status	System V
`jobs`	Process management	Optional (UP)	Report background jobs
`join`	Text processing	Mandatory	Merges two sorted text files based on the presence of a common field	Version 7 AT&T UNIX
`kill`	Process management	Mandatory	Terminate or signal processes	Version 4 AT&T UNIX
`lex`	C programming	Optional (CD)	Generate programs forlexical tasks	Version 7 AT&T UNIX
`link`	Filesystem	Optional (XSI)	Create a hard link to a file	Version 1 AT&T UNIX
`ln`	Filesystem	Mandatory	Link files	Version 1 AT&T UNIX
`locale`	Misc	Mandatory	Get locale-specific information
`localedef`	Misc	Mandatory	Define locale environment
`logger`	Shell programming	Mandatory	Log messages	4.3BSD
`logname`	Misc	Mandatory	Report the user's login name	4.4BSD
`lp`	Text processing	Mandatory	Send files to a printer	System V
`ls`	Filesystem	Mandatory	List directory contents	Version 1 AT&T UNIX
`m4`	Misc	Mandatory	Macro processor	PWB UNIX
`mailx`	Misc	Mandatory	Process messages	Version 1 AT&T UNIX
`make`	Programming	Optional (SD)	Maintain, update, and regenerate groups of programs	PWB UNIX
`man`	Misc	Mandatory	Display system documentation	Version 2 AT&T UNIX
`mesg`	Misc	Mandatory	Permit or deny messages	Version 1 AT&T UNIX
`mkdir`	Filesystem	Mandatory	Make directories	Version 1 AT&T UNIX
`mkfifo`	Filesystem	Mandatory	MakeFIFO special files	4.4BSD^{[dubious –discuss]}
`more`	Text processing	Optional (UP)	Display files on a page-by-page basis	3BSD
`msgfmt`	Misc	Mandatory	Create messages objects from messages object files
`mv`	Filesystem	Mandatory	Move or rename files	Version 1 AT&T UNIX
`newgrp`	Misc	Mandatory	Change to a new group	Version 6 AT&T UNIX
`ngettext`	Misc	Mandatory	Retrieve text string from messages object with plural form
`nice`	Process management	Mandatory	Invoke a utility with an altered nice value	Version 4 AT&T UNIX
`nl`	Text processing	Optional (XSI)	Line numbering filter	System III
`nm`	C programming	Optional (SD, XSI)	Write the name list of anobject file	Version 1 AT&T UNIX
`nohup`	Process management	Mandatory	Invoke a utility immune tohangups	Version 4 AT&T UNIX
`od`	Misc	Mandatory	Dump files in various formats	Version 1 AT&T UNIX
`paste`	Text processing	Mandatory	Merge corresponding or subsequent lines of files	Version 32V AT&T UNIX
`patch`	Text processing	Mandatory	Apply changes to files	4.3BSD
`pathchk`	Filesystem	Mandatory	Check pathnames
`pax`	Misc	Mandatory	Portable archive interchange	4.4BSD^{[citation needed]}
`pr`	Text processing	Mandatory	Paginate or columnate files for printing	Version 1 AT&T UNIX
`printf`	Shell programming	Mandatory	Write formatted output	4.3BSD-Reno
`prs`	SCCS	Optional (XSI)	Print an SCCS file	PWB UNIX
`ps`	Process management	Mandatory	Report process status	Version 4 AT&T UNIX
`pwd`	Filesystem	Mandatory	Print working directory	Version 5 AT&T UNIX
`read`	Shell programming	Mandatory	Read a line from standard input
`readlink`	Filesystem	Mandatory	Print destination of a symbolic link
`realpath`	Filesystem	Mandatory	Report thefully qualified path of a file	XPG4^[1]
`renice`	Process management	Mandatory	Set nice values of running processes	4BSD
`rm`	Filesystem	Mandatory	Remove file(s)	Version 1 AT&T UNIX
`rmdel`	SCCS	Optional (XSI)	Remove a delta from an SCCS file	PWB UNIX
`rmdir`	Filesystem	Mandatory	Remove empty directory(ies)	Version 1 AT&T UNIX
`sact`	SCCS	Optional (XSI)	Print current SCCS file-editing activity	System III
`sccs`	SCCS	Optional (XSI)	Front end for the SCCS subsystem	4.3BSD
`sed`	Text processing	Mandatory	Stream editor	Version 7 AT&T UNIX
`sh`	Shell programming	Mandatory	Shell, the standard command language interpreter	Version 7 AT&T UNIX (in earlier versions, sh was either theThompson shell or thePWB shell)
`sleep`	Shell programming	Mandatory	Suspend execution for an interval	Version 4 AT&T UNIX
`sort`	Text processing	Mandatory	Sort, merge, or sequence check text files	Version 1 AT&T UNIX
`split`	Misc	Mandatory	Split files into pieces	Version 3 AT&T UNIX
`strings`	C programming	Mandatory	Find printable strings in files	2BSD
`strip`	C programming	Optional (SD)	Remove unnecessary information from executable files	Version 1 AT&T UNIX
`stty`	Misc	Mandatory	Set the options for a terminal	Version 2 AT&T UNIX
`tabs`	Misc	Mandatory	Set terminal tabs	PWB UNIX
`tail`	Text processing	Mandatory	Copy the last part of a file	PWB UNIX^{[citation needed]}
`talk`	Misc	Optional (UP)	Talk to another user	4.2BSD
`tee`	Shell programming	Mandatory	Duplicate thestandard output	Version 5 AT&T UNIX
`test`	Shell programming	Mandatory	Evaluateexpression	Version 7 AT&T UNIX
`time`	Process management	Mandatory	Display elapsed, system and kernel time used by the current shell or designated process.	Version 3 AT&T UNIX^[2]
`timeout`	Process management	Mandatory	Run command with a time limit	Version 3 AT&T UNIX
`touch`	Filesystem	Mandatory	Change file access and modification times	Version 7 AT&T UNIX
`tput`	Misc	Mandatory	Changeterminal characteristics	System V
`tr`	Text processing	Mandatory	Translate characters	Version 4 AT&T UNIX
`true`	Shell programming	Mandatory	Exit immediately withstatus 0	Version 7 AT&T UNIX
`tsort`	Text processing	Mandatory	Topological sort	Version 7 AT&T UNIX
`tty`	Misc	Mandatory	Report user'sterminal name	Version 1 AT&T UNIX
`type`	Misc	Optional (XSI)	Displays how a name would be interpreted if used as a command
`ulimit`	Misc	Optional (XSI)	Set or report file size limit
`umask`	Misc	Mandatory	Get or set file mode creation mask	System III
`unalias`	Misc	Mandatory	Remove alias definitions
`uname`	Misc	Mandatory	Report system name	PWB UNIX
`uncompress`	Misc	Optional (XSI)	Expand compressed data	4.3BSD
`unexpand`	Text processing	Mandatory	Convert spaces to tabs	3BSD
`unget`	SCCS	Optional (XSI)	Undo a previous get of an SCCS file	System III
`uniq`	Text processing	Mandatory	Report or filter out repeated lines in a file	Version 3 AT&T UNIX
`unlink`	Filesystem	Optional (XSI)	Call the unlink function	Version 1 AT&T UNIX
`uucp`	Network	Optional (UU)	System-to-system copy	Version 7 AT&T UNIX
`uudecode`	Network	Mandatory	Decode a binary file	4BSD
`uuencode`	Network	Mandatory	Encode a binary file	4BSD
`uustat`	Network	Optional (UU)	uucp status inquiry and job control	System III
`uux`	Process management	Optional (UU)	Remote command execution	Version 7 AT&T UNIX
`val`	SCCS	Optional (XSI)	Validate SCCS files	System III
`vi`	Text processing	Optional (UP)	Screen-oriented (visual) display editor	1BSD
`wait`	Process management	Mandatory	Await process completion	Version 4 AT&T UNIX
`wc`	Text processing	Mandatory	Line, word and byte or character count	Version 1 AT&T UNIX
`what`	SCCS	Optional (XSI)	Identify SCCS files	PWB UNIX
`who`	System administration	Optional (XSI)	Display who is on the system	Version 1 AT&T UNIX
`write`	Misc	Mandatory	Write to another user's terminal	Version 1 AT&T UNIX
`xargs`	Shell programming	Mandatory	Construct argument lists and invoke utility	PWB UNIX
`xgettext`	C programming	Optional (CD)	Extract gettext calls from C source code strings	IEEE Std 1003.1-2024
`yacc`	C programming	Optional (CD)	Yet anothercompiler compiler	PWB UNIX
`zcat`	Text processing	Optional (XSI)	Expand and concatenate compressed data	4.3BSD

Name

Category

Status (Option code)

Description

First appeared

admin

SCCS

Optional (XSI)

Create and administerSCCS files

PWB UNIX

alias

Misc

Mandatory

Manage command aliases

ar

Misc

Mandatory

Managelibrary archives

Version 1 AT&T UNIX

asa

Text processing

Optional (FR)

Interpretcarriage-control characters

System V

at

Process management

Mandatory

Execute commands at a later time

Version 7 AT&T UNIX

awk

Text processing

Mandatory

Pattern scanning and processing language

Version 7 AT&T UNIX

basename

Filesystem

Mandatory

Report non-directory portion of a pathname

Version 7 AT&T UNIX

batch

Process management

Mandatory

Schedule commands to be executed in a batch queue

bc

Misc

Mandatory

Arbitrary-precision arithmetic calculator

Version 6 AT&T UNIX

bg

Process management

Optional (UP)

Move jobs to the background

cc

C programming

Optional (CD)

Compile C source code

IEEE Std 1003.1-2024

cal

Misc

Optional (XSI)

Print a calendar

Version 5 AT&T UNIX

cat

Filesystem

Mandatory

Concatenate and print files

PDP-7 UNIX

cd

Filesystem

Mandatory

Change the working directory

Version 6 AT&T UNIX

cflow

C programming

Optional (XSI)

Generate a C-languagecall graph

System V

chgrp

Filesystem

Mandatory

Change file group ownership

PWB UNIX

chmod

Filesystem

Mandatory

Change file modes/attributes/permissions

PDP-7 UNIX

chown

Filesystem

Mandatory

Change file ownership

PDP-7 UNIX

cksum

Filesystem

Mandatory

Report filechecksum and size

4.4BSD

cmp

Filesystem

Mandatory

Compare two files

Version 1 AT&T UNIX

comm

Text processing

Mandatory

Select or reject lines common to two files

Version 4 AT&T UNIX

command

Shell programming

Mandatory

Execute a simple command

compress

Filesystem

Optional (XSI)

Compress data

4.3BSD

cp

Filesystem

Mandatory

Copy files

PDP-7 UNIX

cron

Misc

Mandatory

Schedule periodic background work

System V

csplit

Text processing

Mandatory

Split files based on context

PWB UNIX

ctags

C programming

Optional (SD)

Create a tags file

3BSD

cut

Text processing

Mandatory

Cut out selected fields of each line of a file

System III

cxref

C programming

Optional (XSI)

Generate aC-language program cross-reference table

System V

date

Misc

Mandatory

Report or change system date and time

Version 1 AT&T UNIX

dd

Filesystem

Mandatory

Convert and copy files

Version 5 AT&T UNIX

delta

SCCS

Optional (XSI)

Make a delta (change) to an SCCS file

PWB UNIX

df

Filesystem

Mandatory

Report free storage space

Version 1 AT&T UNIX

diff

Text processing

Mandatory

Compare two files

Version 5 AT&T UNIX

dirname

Filesystem

Mandatory

Report the directory portion of a pathname

System III

du

Filesystem

Mandatory

Estimate file space usage

Version 1 AT&T UNIX

echo

Shell programming

Mandatory

Write to standard output

Version 2 AT&T UNIX

ed

Text processing

Mandatory

The standard text editor

PDP-7 UNIX

env

Misc

Mandatory

Set the environment for command invocation

System III

ex

Text processing

Optional (UP)

Text editor

1BSD

expand

Text processing

Mandatory

Convert tabs to spaces

3BSD

expr

Shell programming

Mandatory

Evaluate arguments as an expression

Version 7 AT&T UNIX

false

Shell programming

Mandatory

Exit immediately withstatus 1

Version 7 AT&T UNIX

fc

Misc

Optional (UP)

Process the command history list

fg

Process management

Optional (UP)

Move a job to the foreground

file

Filesystem

Mandatory

Report type of files

Version 4 AT&T UNIX

find

Filesystem

Mandatory

Find files

Version 1 AT&T UNIX

fold

Text processing

Mandatory

Filter for folding lines

1BSD

fuser

Process management

Optional (XSI)

Listprocess IDs of all processes that have one or more files open

System V

gencat

Misc

Mandatory

Generate a formatted message catalog

get

SCCS

Optional (XSI)

Get a version of an SCCS file

PWB UNIX

getconf

Misc

Mandatory

Get configuration values

getopts

Shell programming

Mandatory

Parse utility options

gettext

Misc

Mandatory

Retrieve text string from messages object

grep

Misc

Mandatory

Search text for a pattern

Version 4 AT&T UNIX

hash

Misc

Mandatory

Hash database access method

head

Text processing

Mandatory

Copy the first part of files

PWB UNIX^{[citation needed]}

iconv

Text processing

Mandatory

Codeset conversion

HP-UX

id

Misc

Mandatory

Report user identity

System V

ipcrm

Misc

Optional (XSI)

Remove a message queue, semaphore set, or shared memory segment identifier

System V

ipcs

Misc

Optional (XSI)

Report interprocess communication facilities status

System V

jobs

Process management

Optional (UP)

Report background jobs

join

Text processing

Mandatory

Merges two sorted text files based on the presence of a common field

Version 7 AT&T UNIX

kill

Process management

Mandatory

Terminate or signal processes

Version 4 AT&T UNIX

lex

C programming

Optional (CD)

Generate programs forlexical tasks

Version 7 AT&T UNIX

link

Filesystem

Optional (XSI)

Create a hard link to a file

Version 1 AT&T UNIX

ln

Filesystem

Mandatory

Link files

Version 1 AT&T UNIX

locale

Misc

Mandatory

Get locale-specific information

localedef

Misc

Mandatory

Define locale environment

logger

Shell programming

Mandatory

Log messages

4.3BSD

logname

Misc

Mandatory

Report the user's login name

4.4BSD

lp

Text processing

Mandatory

Send files to a printer

System V

ls

Filesystem

Mandatory

List directory contents

Version 1 AT&T UNIX

m4

Misc

Mandatory

Macro processor

PWB UNIX

mailx

Misc

Mandatory

Process messages

Version 1 AT&T UNIX

make

Programming

Optional (SD)

Maintain, update, and regenerate groups of programs

PWB UNIX

man

Misc

Mandatory

Display system documentation

Version 2 AT&T UNIX

mesg

Misc

Mandatory

Permit or deny messages

Version 1 AT&T UNIX

mkdir

Filesystem

Mandatory

Make directories

Version 1 AT&T UNIX

mkfifo

Filesystem

Mandatory

MakeFIFO special files

4.4BSD^{[dubious –discuss]}

more

Text processing

Optional (UP)

Display files on a page-by-page basis

3BSD

msgfmt

Misc

Mandatory

Create messages objects from messages object files

mv

Filesystem

Mandatory

Move or rename files

Version 1 AT&T UNIX

newgrp

Misc

Mandatory

Change to a new group

Version 6 AT&T UNIX

ngettext

Misc

Mandatory

Retrieve text string from messages object with plural form

nice

Process management

Mandatory

Invoke a utility with an altered nice value

Version 4 AT&T UNIX

nl

Text processing

Optional (XSI)

Line numbering filter

System III

nm

C programming

Optional
(SD, XSI)

Write the name list of anobject file

Version 1 AT&T UNIX

nohup

Process management

Mandatory

Invoke a utility immune tohangups

Version 4 AT&T UNIX

od

Misc

Mandatory

Dump files in various formats

Version 1 AT&T UNIX

paste

Text processing

Mandatory

Merge corresponding or subsequent lines of files

Version 32V AT&T UNIX

patch

Text processing

Mandatory

Apply changes to files

4.3BSD

pathchk

Filesystem

Mandatory

Check pathnames

pax

Misc

Mandatory

Portable archive interchange

4.4BSD^{[citation needed]}

pr

Text processing

Mandatory

Paginate or columnate files for printing

Version 1 AT&T UNIX

printf

Shell programming

Mandatory

Write formatted output

4.3BSD-Reno

prs

SCCS

Optional (XSI)

Print an SCCS file

PWB UNIX

ps

Process management

Mandatory

Report process status

Version 4 AT&T UNIX

pwd

Filesystem

Mandatory

Print working directory

Version 5 AT&T UNIX

read

Shell programming

Mandatory

Read a line from standard input

readlink

Filesystem

Mandatory

Print destination of a symbolic link

realpath

Filesystem

Mandatory

Report thefully qualified path of a file

XPG4^[1]

renice

Process management

Mandatory

Set nice values of running processes

4BSD

rm

Filesystem

Mandatory

Remove file(s)

Version 1 AT&T UNIX

rmdel

SCCS

Optional (XSI)

Remove a delta from an SCCS file

PWB UNIX

rmdir

Filesystem

Mandatory

Remove empty directory(ies)

Version 1 AT&T UNIX

sact

SCCS

Optional (XSI)

Print current SCCS file-editing activity

System III

sccs

SCCS

Optional (XSI)

Front end for the SCCS subsystem

4.3BSD

sed

Text processing

Mandatory

Stream editor

Version 7 AT&T UNIX

sh

Shell programming

Mandatory

Shell, the standard command language interpreter

Version 7 AT&T UNIX
(in earlier versions, sh was either theThompson shell or thePWB shell)

sleep

Shell programming

Mandatory

Suspend execution for an interval

Version 4 AT&T UNIX

sort

Text processing

Mandatory

Sort, merge, or sequence check text files

Version 1 AT&T UNIX

split

Misc

Mandatory

Split files into pieces

Version 3 AT&T UNIX

strings

C programming

Mandatory

Find printable strings in files

2BSD

strip

C programming

Optional (SD)

Remove unnecessary information from executable files

Version 1 AT&T UNIX

stty

Misc

Mandatory

Set the options for a terminal

Version 2 AT&T UNIX

tabs

Misc

Mandatory

Set terminal tabs

PWB UNIX

tail

Text processing

Mandatory

Copy the last part of a file

PWB UNIX^{[citation needed]}

talk

Misc

Optional (UP)

Talk to another user

4.2BSD

tee

Shell programming

Mandatory

Duplicate thestandard output

Version 5 AT&T UNIX

test

Shell programming

Mandatory

Evaluateexpression

Version 7 AT&T UNIX

time

Process management

Mandatory

Display elapsed, system and kernel time used by the current shell or designated process.

Version 3 AT&T UNIX^[2]

timeout

Process management

Mandatory

Run command with a time limit

Version 3 AT&T UNIX

touch

Filesystem

Mandatory

Change file access and modification times

Version 7 AT&T UNIX

tput

Misc

Mandatory

Changeterminal characteristics

System V

tr

Text processing

Mandatory

Translate characters

Version 4 AT&T UNIX

true

Shell programming

Mandatory

Exit immediately withstatus 0

Version 7 AT&T UNIX

tsort

Text processing

Mandatory

Topological sort

Version 7 AT&T UNIX

tty

Misc

Mandatory

Report user'sterminal name

Version 1 AT&T UNIX

type

Misc

Optional (XSI)

Displays how a name would be interpreted if used as a command

ulimit

Misc

Optional (XSI)

Set or report file size limit

umask

Misc

Mandatory

Get or set file mode creation mask

System III

unalias

Misc

Mandatory

Remove alias definitions

uname

Misc

Mandatory

Report system name

PWB UNIX

uncompress

Misc

Optional (XSI)

Expand compressed data

4.3BSD

unexpand

Text processing

Mandatory

Convert spaces to tabs

3BSD

unget

SCCS

Optional (XSI)

Undo a previous get of an SCCS file

System III

uniq

Text processing

Mandatory

Report or filter out repeated lines in a file

Version 3 AT&T UNIX

unlink

Filesystem

Optional (XSI)

Call the unlink function

Version 1 AT&T UNIX

uucp

Network

Optional (UU)

System-to-system copy

Version 7 AT&T UNIX

uudecode

Network

Mandatory

Decode a binary file

4BSD

uuencode

Network

Mandatory

Encode a binary file

4BSD

uustat

Network

Optional (UU)

uucp status inquiry and job control

System III

uux

Process management

Optional (UU)

Remote command execution

Version 7 AT&T UNIX

val

SCCS

Optional (XSI)

Validate SCCS files

System III

vi

Text processing

Optional (UP)

Screen-oriented (visual) display editor

1BSD

wait

Process management

Mandatory

Await process completion

Version 4 AT&T UNIX

wc

Text processing

Mandatory

Line, word and byte or character count

Version 1 AT&T UNIX

what

SCCS

Optional (XSI)

Identify SCCS files

PWB UNIX

who

System administration

Optional (XSI)

Display who is on the system

Version 1 AT&T UNIX

write

Misc

Mandatory

Write to another user's terminal

Version 1 AT&T UNIX

xargs

Shell programming

Mandatory

Construct argument lists and invoke utility

PWB UNIX

xgettext

C programming

Optional (CD)

Extract gettext calls from C source code strings

IEEE Std 1003.1-2024

yacc

C programming

Optional (CD)

Yet anothercompiler compiler

PWB UNIX

zcat

Text processing

Optional (XSI)

Expand and concatenate compressed data

4.3BSD

v t e Unix command-line interface programs andshell builtins
File system	cat chattr chmod chown chgrp cksum cmp cp dd du df file fuser ln ls mkdir mv pax pwd rm rmdir split tee touch type umask
Processes	at bg crontab fg kill nice ps time
User environment	env exit logname mesg talk tput uname who write
Text processing	awk basename comm csplit cut diff dirname ed ex fold head iconv join m4 more nl paste patch printf read sed sort strings tail tr troff uniq vi wc xargs
Shell builtins	alias cd echo test unset wait
Searching	find grep
Documentation	man
Software development	ar ctags lex make nm strip yacc
Miscellaneous	bc cal expr lp od sleep true and false
Categories Standard Unix programs Unix SUS2008 utilities List

Movatterモバイル変換

List of POSIX commands

See also

References

External links