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  2. echo (command) - Wikipedia

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

    In computing, echo is a command that outputs the strings that are passed to it as arguments. It is a command available in various operating system shells and typically used in shell scripts and batch files to output status text to the screen [1] or a computer file, or as a source part of a pipeline.

  3. script (Unix) - Wikipedia

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

    The above script records to script.log all output of the exec command. However, some interactive programs (such as Python ) do not echo their standard input when run under the resulting shell, although they do when run under the script command, again due to the detection of a terminal.

  4. List of DOS commands - Wikipedia

    en.wikipedia.org/wiki/List_of_DOS_commands

    The ECHO command prints its own arguments back out to the DOS equivalent of the standard output stream. (Hence the name, ECHO) Usually, this means directly to the screen, but the output of echo can be redirected, like any other command, to files or devices. Often used in batch files to print text out to the user. Another important use of the ...

  5. 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 ...

  6. true and false (commands) - Wikipedia

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

    The true command is sometimes substituted with the very similar null command, [1] written as a single colon (:). The null command is built into the shell, and may therefore be more efficient if true is an external program (true is usually a shell built in function).

  7. 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 command languages . Typical operations performed by shell scripts include file manipulation, program execution, and printing text.

  8. Redirection (computing) - Wikipedia

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

    A sequence such as Worker | TimeStamp > LogFile.txt would produce timestamps only when Worker had finished, merely showing how swiftly its output file could be read and written. A good example for command piping is combining echo with another command to achieve something interactive in a non-interactive shell, e.g. echo-e 'user\npass' | ftp ...

  9. Comparison of command shells - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_command_shells

    A shell that can determine ahead of invocation that there are missing mandatory values, can assist the interactive user by prompting for those values instead of letting the command fail. Having the shell prompt for missing values will allow the author of a script, command or function to mark a parameter as mandatory instead of creating script ...