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Command history is a feature in many operating system shells, computer algebra programs, and other software that allows the user to recall, edit and rerun previous commands. Command line history was added to Unix in Bill Joy 's C shell of 1978; Joy took inspiration from an earlier implementation in Interlisp . [ 1 ]
The history command has the following syntax in tcsh: history [-hTr] [n] history -S|-L|-M [filename] (+) history -c (+) The first form prints the history event list. If n is given only the n most recent events are printed or saved. With -h, the history list is printed without leading numbers.
GNU Readline is a software library that provides in-line editing and history capabilities for interactive programs with a command-line interface, such as Bash.It is currently maintained by Chet Ramey as part of the GNU Project.
Bash, short for Bourne-Again SHell, is a shell program and command language supported by the Free Software Foundation [2] and first developed for the GNU Project [3] by Brian Fox. [4] Designed as a 100% [ 5 ] free software alternative for the Bourne shell , [ 6 ] [ 7 ] [ 8 ] it was initially released in 1989. [ 9 ]
Support for command history means that a user can recall a previous command into the command-line editor and edit it before issuing the potentially modified command. Shells that support completion may also be able to directly complete the command from the command history given a partial/initial part of the previous command.
fc is a standard program on Unix and Unix-like operating systems that lists, edits and reexecutes commands previously entered to an interactive shell. fc is a builtin command in the Bash and Zsh shells and is an initialism for "fix command". It is particularly helpful for editing complex, multi-line commands.
less is a terminal pager program on Unix, Windows, and Unix-like systems used to view (but not change) the contents of a text file one screen at a time. It is similar to more, but has the extended capability of allowing both forward and backward navigation through the file.
Process substitution can also be used to capture output that would normally go to a file, and redirect it to the input of a process. The Bash syntax for writing to a process is >(command). Here is an example using the tee, wc and gzip commands that counts the lines in a file with wc -l and compresses it with gzip in one pass: