UNIX shell - definition. What is UNIX shell
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Unix shell         
COMMAND-LINE INTERPRETER FOR UNIX OPERATING SYSTEM
UNIX shell; Unix shells; .cshrc; .profile; Linux Shell; Unix Shell; Linux shell; POSIX shell; Shell (Unix); .login; Unix shell command line interpreter
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 command language and a scripting language, and is used by the operating system to control the execution of the system using shell scripts.
.cshrc         
COMMAND-LINE INTERPRETER FOR UNIX OPERATING SYSTEM
UNIX shell; Unix shells; .cshrc; .profile; Linux Shell; Unix Shell; Linux shell; POSIX shell; Shell (Unix); .login; Unix shell command line interpreter
<operating system> (C Shell run commands) A C Shell startup configuration file. This file is found in a user's {home directory} and can contain shell and other commands to set variables, define aliases, and perform any other initialisation which should happen for every shell (as opposed to .login which is only run for a login shell). Compare AUTOEXEC.BAT on MS-DOS. See also rc. (1996-04-09)
Bash (Unix shell)         
GNU PROJECT IMPLEMENTATION OF THE STANDARD UNIX SHELL
Bash script; Bourne-Again shell; Bourne Again Shell; Bash shell; Bash (shell); Born again shell; Bourne-again shell; Bourne again shell; GNU bash; GNU Bash; Bashism; Bourne-Again shell (programming language); Bash (program); /bin/bash; Bash (software); Bash (unix); Born Again Shell; Bourne-Again Shell; Born-Again SHell; Born Again SHell; Bourne Again SHell; Bourne-Again SHell; GNU Bourne-Again SHell; GNU Born-Again Shell; GNU Born Again Shell; GNU Bourne Again Shell; GNU Bourne-Again Shell; GNU Born-Again SHell; GNU Born Again SHell; GNU Bourne Again SHell; Bash unix; Bash (Unix); Bash scripting language; Brace expansion; Alternation (string expansion); Bashbug; .bash profile; .bash login; .bashrc; Bashrc; .bash logout; Bash (programming language)

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. First released in 1989, it has been used as the default login shell for most Linux distributions. Bash was one of the first programs Linus Torvalds ported to Linux, alongside GCC. A version is also available for Windows 10 and Windows 11 via the Windows Subsystem for Linux. It is also the default user shell in Solaris 11. 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.

Bash is a command processor that typically runs in a text window where the user types commands that cause actions. Bash can also read and execute commands from a file, called a shell script. Like most Unix shells, it supports filename globbing (wildcard matching), piping, here documents, command substitution, variables, and control structures for condition-testing and iteration. The keywords, syntax, dynamically scoped variables and other basic features of the language are all copied from sh. Other features, e.g., history, are copied from csh and ksh. Bash is a POSIX-compliant shell, but with a number of extensions.

The shell's name is an acronym for Bourne Again Shell, a pun on the name of the Bourne shell that it replaces and the notion of being "born again".

A security hole in Bash dating from version 1.03 (August 1989), dubbed Shellshock, was discovered in early September 2014 and quickly led to a range of attacks across the Internet. Patches to fix the bugs were made available soon after the bugs were identified.