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  2. tty (Unix) - Wikipedia

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

    The tty command is commonly used to check if the output medium is a terminal. The command prints the file name of the terminal connected to standard input. If no file is detected (in case, it's being run as part of a script or the command is being piped) "not a tty" is printed to stdout and the command exits with an exit status of 1.

  3. List of GNU Core Utilities commands - Wikipedia

    en.wikipedia.org/wiki/List_of_GNU_Core_Utilities...

    Changes and prints terminal line settings tee: Sends output to multiple files test: Evaluates an expression timeout: Run a command with a time limit true: Does nothing, but exits successfully tty: Prints terminal name uname: Prints system information unlink: Removes the specified file using the unlink function uptime: Tells how long the system ...

  4. tee (command) - Wikipedia

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

    Example usage of tee: The output of ls -l is redirected to tee which copies them to the file file.txt and to the pager less. The name tee comes from this scheme - it looks like the capital letter T. The tee command is normally used to split the output of a program so that it can be both displayed and saved in a file. The command can be used to ...

  5. Standard streams - Wikipedia

    en.wikipedia.org/wiki/Standard_streams

    Standard output is a stream to which a program writes its output data. The program requests data transfer with the write operation. Not all programs generate output. For example, the file rename command (variously called mv, move, or ren) is silent on success. Unless redirected, standard output is

  6. cat (Unix) - Wikipedia

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

    A common interactive use of cat for a single file is to output the content of a file to standard output. However, if the output is piped or redirected, cat is unnecessary. A cat written with UUOC might still be preferred for readability reasons, as reading a piped stream left-to-right might be easier to conceptualize. [14]

  7. Bash (Unix shell) - Wikipedia

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

    On modern Linuxes, information on shell built-in commands can be found by executing help, help [built-in name]or man builtins at a terminal prompt where bash is installed. Some commands, such as echo , false , kill , printf , test or true , depending on your system and on your locally installed version of bash, can refer to either a shell built ...

  8. less (Unix) - Wikipedia

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

    By default, less displays the contents of the file to the standard output (one screen at a time). If the file name argument is omitted, it displays the contents from standard input (usually the output of another command through a pipe). If the output is redirected to anything other than a terminal, for example a pipe to another command, less ...

  9. Pipeline (Unix) - Wikipedia

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

    Each process takes input from the previous process and produces output for the next process via standard streams. Each | tells the shell to connect the standard output of the command on the left to the standard input of the command on the right by an inter-process communication mechanism called an (anonymous) pipe, implemented in the operating ...