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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 .
A group of Standards Committees from the IEEE, the Open Group and the ISO/IEC began working on the Single UNIX Specification v 3; they together became known as the Austin Group. A Technical Standard for Shell and Utilities was created in The Open Group Base Specifications, Issue 6, which is itself a part of the Single UNIX Specification v 3. [43]
In the lower right we can see a terminal emulator running a Unix shell, in which the user can type commands as if they were sitting at a terminal. In computing , a shell is a computer program that exposes an operating system 's services to a human user or other programs.
There are many variants of Unix shell: Bourne shell sh. Almquist shell (ash) Debian Almquist shell (dash) Bash (Unix shell) bash; KornShell ksh. Z shell zsh; C shell csh. TENEX C shell tcsh; Ch shell ch; Emacs shell eshell; Friendly interactive shell fish; PowerShell pwsh; rc shell rc, a shell for Plan 9 from Bell Labs and Unix; Stand-alone ...
In the GNOME (a UNIX-like derivative) interface, the Run command is used to run applications via terminal commands. It can be accessed by pressing Alt+F2. KDE (a UNIX-like derivative) has similar functionality called KRunner. It is accessible via the same key binds. The Multics shell includes a run command to run a command in an isolated ...
fshell is a free and open-source terminal emulator for Symbian 9.1-9.4, developed by Accenture. [3] Has a desktop app, Muxcons, to remotely control smartphone throw fshell. [4] [5] GNOME Terminal: Character: Local X11, Wayland: Unix-based Default terminal for GNOME with native Wayland support guake: Character: Local X11, Wayland: Unix-based
Implementations of the Unix shell are also available as part of the POSIX sub-system, [39] Cygwin, MKS Toolkit, UWIN, Hamilton C shell and other software packages. Available shells for these interoperability tools include csh, ksh, sh, Bash, rsh, tclsh and less commonly zsh, psh; Implementations of PHP have a shell for interactive use called ...
Commands with long or difficult to spell filenames can be entered by typing the first few characters and pressing a completion key, which completes the command or filename. In the case of multiple possible completions, some command-line interpreters, especially Unix shells, will list all possible completions beginning with those few characters.