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  2. Command-line argument parsing - Wikipedia

    en.wikipedia.org/wiki/Command-line_argument_parsing

    Node.js programs are invoked by running the interpreter node interpreter with a given file, so the first two arguments will be node and the name of the JavaScript source file. It is often useful to extract the rest of the arguments by slicing a sub-array from process.argv. [11]

  3. Unix shell - Wikipedia

    en.wikipedia.org/wiki/Unix_shell

    The "rc" suffix on some Unix configuration files (for example, ".vimrc"), is a remnant of the RUNCOM ancestry of Unix shells. [1] [4] The PWB shell or Mashey shell, sh, was an upward-compatible version of the Thompson shell, augmented by John Mashey and others and distributed with the Programmer's Workbench UNIX, circa 1975–1977. It focused ...

  4. 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 ...

  5. getopts - Wikipedia

    en.wikipedia.org/wiki/Getopts

    The Linux enhanced version of getopt has the extra safety of getopts plus more advanced features. It supports long option names (e.g. --help ) and the options do not have to appear before all the operands (e.g. command operand1 operand2 -a operand3 -b is permitted by the Linux enhanced version of getopt but does not work with getopts ).

  6. Bash (Unix shell) - Wikipedia

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

    However, for explicit licensing reasons with Catalina [69] (c.2019), Apple replaced its default shell, Bash version 3.2 (c.2006), with Z Shell version 5.7 (c.2019). [70] [71] "The bash binary bundled with macOS has been stuck on version 3.2 for a long time now. bash v4 was released in 2009 and bash v5 in January 2019. The reason Apple has not ...

  7. Bourne shell - Wikipedia

    en.wikipedia.org/wiki/Bourne_shell

    The Bourne shell (sh) is a shell command-line interpreter for computer operating systems.It first appeared on Version 7 Unix, as its default shell. Unix-like systems continue to have /bin/sh—which will be the Bourne shell, or a symbolic link or hard link to a compatible shell—even when other shells are used by most users.

  8. xargs - Wikipedia

    en.wikipedia.org/wiki/Xargs

    xargs (short for "extended arguments") [1] is a command on Unix and most Unix-like operating systems used to build and execute commands from standard input. It converts input from standard input into arguments to a command. Some commands such as grep and awk can take input either as

  9. Usage message - Wikipedia

    en.wikipedia.org/wiki/Usage_message

    They often begin with "Usage:" , the command, followed by a list of arguments. To indicate optional arguments, square brackets are commonly used, and can also be used to group parameters that must be specified together. To indicate required arguments, angled brackets are commonly used, following the same grouping conventions as square brackets.