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  2. Z shell - Wikipedia

    en.wikipedia.org/wiki/Z_shell

    The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a command interpreter for shell scripting. Zsh is an extended Bourne shell with many improvements, including some features of Bash, ksh, and tcsh. Zsh was created by Paul Falstad in 1990 while he was a student at Princeton University.

  3. Bad command or file name - Wikipedia

    en.wikipedia.org/wiki/Bad_command_or_file_name

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  4. Abort, Retry, Fail? - Wikipedia

    en.wikipedia.org/wiki/Abort,_Retry,_Fail?

    Humorous variations of Edgar Allen Poe's The Raven using "Abort, Retry, Ignore?" in place of "nevermore" were written in the 1980s and 1990s and were quite popular, distributed by bulletin board and email. [5]

  5. Bash (Unix shell) - Wikipedia

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

    In Linux, if the script was executed by a regular user, the shell would attempt to execute the command rm -rf / as a regular user, and the command would fail. However, if the script was executed by the root user, then the command would likely succeed and the filesystem would be erased.

  6. history (command) - Wikipedia

    en.wikipedia.org/wiki/History_(command)

    The history command works with the command history list. When the command is issued with no options, it prints the history list. Users can supply options and arguments to the command to manipulate the display of the history list and its entries. The operation of the history command can also be influenced by a shell's environment variables. For ...

  7. robots.txt - Wikipedia

    en.wikipedia.org/wiki/Robots.txt

    A robots.txt file contains instructions for bots indicating which web pages they can and cannot access. Robots.txt files are particularly important for web crawlers from search engines such as Google. A robots.txt file on a website will function as a request that specified robots ignore specified files or directories when crawling a site.

  8. Here document - Wikipedia

    en.wikipedia.org/wiki/Here_document

    Inline files are referenced as << or <<pathname: the first notation creates a temporary file, the second notation creates (or overwrites) the file with the specified pathname. An inline file is terminated with << on a line by itself, optionally followed by the (case-insensitive) keyword KEEP or NOKEEP to indicate whether the created file should ...

  9. 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.