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  2. Shell script - Wikipedia

    en.wikipedia.org/wiki/Shell_script

    Editing a FreeBSD shell script for configuring ipfirewall. 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 ...

  3. sed - Wikipedia

    en.wikipedia.org/wiki/Sed

    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).

  4. Bash (Unix shell) - Wikipedia

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

    Bash can execute the vast majority of Bourne shell scripts without modification, with the exception of Bourne shell scripts stumbling into fringe syntax behavior interpreted differently in Bash or attempting to run a system command matching a newer Bash builtin, etc. Bash command syntax includes ideas drawn from the Korn Shell (ksh) and the C ...

  5. Unix shell - Wikipedia

    en.wikipedia.org/wiki/Unix_shell

    tcsh and sh shell windows on a Mac OS X Leopard [1] desktop. 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 ...

  6. C shell - Wikipedia

    en.wikipedia.org/wiki/C_shell

    Download as PDF; Printable version; In other projects ... Here is a second example, comparing scripts that calculate the first 10 powers of 2. ... The C shell's job ...

  7. Comparison of command shells - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_command_shells

    If a script is invoked as an argument to the interpreting shell, it will be executed regardless of whether the user holds the execute permission for that script. Although Windows also specifies an execute permission, none of the Windows-specific shells block script execution if the permission has not been granted.

  8. true and false (commands) - Wikipedia

    en.wikipedia.org/wiki/True_and_false_(commands)

    The null command may take parameters, which are ignored. It is also used as a no-op dummy command for side-effects such as assigning default values to shell variables through the ${parameter:=word} parameter expansion form. [2] For example, from bashbug, the bug-reporting script for Bash: : $

  9. ANSI escape code - Wikipedia

    en.wikipedia.org/wiki/ANSI_escape_code

    The Xterm terminal emulator. In the early 1980s, large amounts of software directly used these sequences to update screen displays. This included everything on VMS (which assumed DEC terminals), most software designed to be portable on CP/M home computers, and even lots of Unix software as it was easier to use than the termcap libraries, such as the shell script examples below in this article.