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The terms foobar (/ ˈfuːbɑːr /), foo, bar, baz, qux, quux, [1] and others are used as metasyntactic variables and placeholder names in computer programming or computer-related documentation. [2] They have been used to name entities such as variables, functions, and commands whose exact identity is unimportant and serve only to demonstrate a ...
The example emphasizes many key characteristics of sed: Typical sed programs are rather short and simple. sed scripts can have comments (the line starting with the # symbol). The s (substitute) command is the most important sed command. sed allows simple programming, with commands such as q (quit).
Vim (/ vɪm / ⓘ; [ 5 ]vi improved) is a free and open-source, screen-based text editor program. It is an improved clone of Bill Joy 's vi. Vim's author, Bram Moolenaar, derived Vim from a port of the Stevie editor for Amiga [ 6 ] and released a version to the public in 1991. Vim is designed for use both from a command-line interface and as a ...
This is a list of POSIX (Portable Operating System Interface) commands as specified by IEEE Std 1003.1-2024, which is part of the Single UNIX Specification (SUS). These commands can be found on Unix operating systems and most Unix-like operating systems. This is not a comprehensive list of all utilities that existed in the various historic Unix ...
A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. [1] The various dialects of shell scripts are considered to be command languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. A script which sets up the environment, runs the ...
For example, under Linux up to 64 consoles may be accessed (12 via function keys), each displaying in full-screen text mode. The free software program GNU Screen provides for managing multiple sessions inside a single TUI, and so can be thought of as being like a window manager for text-mode and command-line interfaces. Tmux can also do this.
For example, consider a script having the initial line #!/bin/sh -x. It may be invoked simply by giving its file path, such as some/path/to/foo, [12] and some parameters, such as bar and baz: some/path/to/foo bar baz In this case /bin/sh is invoked in its place, with parameters -x, some/path/to/foo, bar, and baz, as if the original command had been
Metasyntactic variable. A metasyntactic variable is a specific word or set of words identified as a placeholder in computer science and specifically computer programming. These words are commonly found in source code and are intended to be modified or substituted before real-world usage. For example, foo and bar are used in over 330 Internet ...