Bash is a shell developed by the GNU Project and is compliant with the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. 1 It is based on the Bourne Again SHell and incorporates features from the Korn shell (ksh) and the C shell (csh). 1 It is designed to be compatible with sh and provide useful features from other shells. 1

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Summary Bash is the GNU Project's shell—the Bourne Again SHell. This is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and the C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard
Bash - GNU Project - Free Software Foundation

Bash is a Unix shell and command language written by Brian Fox for the GNU Project as a free software replacement for the Bourne shell.[12][13] First released in 1989,[14] it has been used as the default login shell for most Linux distributions.[15] Bash was one of the first programs Linus Torvalds ported to Linux, alongside GCC.[16] A version is also available for Windows 10 and Windows 11 via the Windows Subsystem for Linux.[17][18] It is also the default user shell in Solaris 11.[19] Bash was also the default shell in versions of Apple macOS from 10.3 (originally, the default shell was tcsh) to the 2019 release of macOS Catalina, which changed the default shell to zsh, although Bash remains available as an alternative shell.[20]
Bash (Unix shell) - Wikipedia

Bash Features (Bash Reference Manual) Next: Job Control , Previous: Shell Variables , Up: Bash Features [ Contents ][ Index ]
Bash Features (Bash Reference Manual)

Bash Reference Manual Next: Introduction , Previous: (dir) , Up: (dir) [ Contents ][ Index ]
Top (Bash Reference Manual)

Bash Features This text is a brief description of the features that are present in the Bash shell (version 5.2, 19 September 2022). The Bash home page is ...
Bash Reference Manual

GNU Bash manual This manual (bash) is available in the following formats:
GNU Bash manual - GNU Project - Free Software Foundation

Variables · Functions · Interpolation · Brace expansions · Loops · Conditional execution · Command substitution · One-page guide to Bash scripting
Bash scripting cheatsheet

Version 1.11 Last updated 20081227 Edition
Bash Guide for Beginners

What is Bash? (Bash Reference Manual) Next: What is a shell? , Up: Introduction [ Contents ][ Index ]
What is Bash? (Bash Reference Manual)

A protip by mehikmat about shell, script, linux, commands, and bash. I found the $#, $@ & $? bash built-in variables very useful since I knew linux and today I ...
$#, $@ & $?: Bash Built-in variables (Example)

Bash 5.2 API documentation with instant search, offline support, keyboard shortcuts, mobile version, and more.
DevDocs — Bash documentation