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2. Shell script - Wikipedia

   en.wikipedia.org/wiki/Shell_script

   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 scripting languages. Typical operations performed by shell scripts include file manipulation, program execution, and printing text. A script which sets up the environment, runs the ...

3. Bash (Unix shell) - Wikipedia

   en.wikipedia.org/wiki/Bash_(Unix_shell)

   External (to the shell) UNIX-style commands, such as 'ls' or 'ln', which are actually separate programs; Internal "commands" such as aliases, built-ins or functions, and; Files containing such commands, i.e., "shell scripts," which do not require compilation before execution and which can be invoked as commands by using their filename.

4. Unix shell - Wikipedia

   en.wikipedia.org/wiki/Unix_shell

   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 .

5. Shell (computing) - Wikipedia

   en.wikipedia.org/wiki/Shell_(computing)

   In computing, a shell is a computer program that exposes an operating system 's services to a human user or other programs. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is the outermost ...

6. Comparison of command shells - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_command_shells

   A shell script (or job) can report progress of long running tasks to the interactive user. Unix/Linux systems may offer other tools support using progress indicators from scripts or as standalone-commands, such as the program "pv". These are not integrated features of the shells, however.

7. C shell - Wikipedia

   en.wikipedia.org/wiki/C_shell

   The C shell can also read commands from a file, called a script. Like all Unix shells, it supports filename wildcarding, piping, here documents, command substitution, variables and control structures for condition-testing and iteration. What differentiated the C shell from others, especially in the 1980s, were its interactive features and ...

8. Shebang (Unix) - Wikipedia

   en.wikipedia.org/wiki/Shebang_(Unix)

   An attempt to directly execute such a file via the operating system's own exec() system call would fail, preventing scripts from behaving uniformly as normal system commands. Version 8 improved shell scripts. In later versions of Unix-like systems, this inconsistency was removed.

9. sed - Wikipedia

   en.wikipedia.org/wiki/Sed

   sed ("stream editor") is a Unix utility that parses and transforms text, using a simple, compact programming language. It was developed from 1973 to 1974 by Lee E. McMahon of Bell Labs, [1] and is available today for most operating systems. [2] sed was based on the scripting features of the interactive editor ed ("editor", 1971) and the earlier ...