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The man page for the sed utility, as seen in various Linux distributions. A man page (short for manual page) is a form of software documentation found on Unix and Unix-like operating systems. Topics covered include programs, system libraries, system calls, and sometimes local system details. The local host administrators can create and install ...
On Unix-like platforms, usage messages usually follow the same common pattern: 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.
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 example, an environment variable can be set to control the number of commands to retain in the list. [1]
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 example ~/.bash_profile below is compatible with the Bourne shell and gives semantics similar to csh for the ~/.bashrc and ~/.bash_login. The [ -r filename ] && cmd is a short-circuit evaluation that tests if filename exists and is readable, skipping the part after the && if it is not.
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.
In computing, apropos is a command to search the man page files in Unix and Unix-like operating systems. Apropos takes its name from the French "à propos" (Latin "ad prÅpositum") which means about. It is particularly useful when searching for commands without knowing their exact names.
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.