Interface) commands as specified by IEEE Std 1003.1-2008, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating...

used in shell scripts and batch files. The command has been implemented in operating systems such as Unix, DOS, IBM OS/2, MetaComCo TRIPOS, AmigaOS (where...

ls is a command to list computer files and directories in Unix and Unix-like operating systems. It is specified by POSIX and the Single UNIX Specification...

The command command in Unix and Unix-like operating systems is a utility to execute a command. It is specified in the POSIX standard. It is present in...

Unix (/ˈjuːnɪks/ , YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T...

manual page) is a form of software documentation usually found on a Unix or Unix-like operating system. Topics covered include computer programs (including...

cat is a standard Unix utility that reads files sequentially, writing them to standard output. The name is derived from its function to (con)catenate files...

A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive...

any version of the Single UNIX Specification. A Unix-like application is one that behaves like the corresponding Unix command or shell. Although there...

Single UNIX Specification (SUS) is a standard for computer operating systems, compliance with which is required to qualify for using the "UNIX" trademark...

rm (short for remove) is a basic command on Unix and Unix-like operating systems used to remove objects such as computer files, directories and symbolic...

In computing, cp is a command in various Unix and Unix-like operating systems for copying files and directories. The command has three principal modes...

The ln command is a standard Unix command utility used to create a hard link or a symbolic link (symlink) to an existing file or directory. The use of...

touch is a command used to update the access date and/or modification date of a computer file or directory. It is included in Unix and Unix-like operating...

tr is a command in Unix, Plan 9, Inferno, and Unix-like operating systems. It is an abbreviation of translate or transliterate, indicating its operation...

df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user...

When a text file with a shebang is used as if it is an executable in a Unix-like operating system, the program loader mechanism parses the rest of the...

wc (short for word count) is a command in Unix, Plan 9, Inferno, and Unix-like operating systems. The program reads either standard input or a list of...

The Unix command su, which stands for 'substitute user' (or historically 'superuser'), is used by a computer user to execute commands with the privileges...

dd is a command-line utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy...

tail is a program available on Unix, Unix-like systems, FreeDOS and MSX-DOS used to display the tail end of a text file or piped data. The version of tail...

computing, time is a command in Unix and Unix-like operating systems. It is used to determine the duration of execution of a particular command. time(1) can exist...

In most Unix and Unix-like operating systems, the ps (process status) program displays the currently-running processes. The related Unix utility top provides...

In computer software, strings is a program in Unix, Plan 9, Inferno, and Unix-like operating systems that finds and prints the strings of printable characters...

The archiver, also known simply as ar, is a Unix utility that maintains groups of files as a single archive file. Today, ar is generally used only to create...

mv is a Unix command that moves one or more files or directories from one place to another. If both filenames are on the same filesystem, this results...

effect. grep was originally developed for the Unix operating system, but later available for all Unix-like systems and some others such as OS-9. Before...

The computer tool patch is a Unix program that updates text files according to instructions contained in a separate file, called a patch file. The patch...

In computing, tty is a command in Unix and Unix-like operating systems to print the file name of the terminal connected to standard input. tty stands for...

env is a shell command for Unix and Unix-like operating systems. It is used to either print a list of environment variables or run another utility in...