hash is a
command
Command may refer to:
Computing
* Command (computing), a statement in a computer language
* command (Unix), a Unix command
* COMMAND.COM, the default operating system shell and command-line interpreter for DOS
* Command key, a modifier key on A ...
on
Unix
Unix (, ; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, whose development started in 1969 at the Bell Labs research center by Ken Thompson, Dennis Ritchie, a ...
and
Unix-like
A Unix-like (sometimes referred to as UN*X, *nix or *NIX) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Uni ...
operating system
An operating system (OS) is system software that manages computer hardware and software resources, and provides common daemon (computing), services for computer programs.
Time-sharing operating systems scheduler (computing), schedule tasks for ...
s that prints the location information for the commands found. The command has also been ported to the
IBM i
IBM i (the ''i'' standing for ''integrated'') is an operating system developed by IBM for IBM Power Systems. It was originally released in 1988 as OS/400, as the sole operating system of the IBM AS/400 line of systems. It was renamed to i5/OS in 2 ...
operating system.
Syntax
$ hash
ame
Description
When the user gives a command, the shell searches for the command in the path specified in the
PATH environmental variable and stores the location in the hash. This command can be used to search for the command given. The command is built into the shell.
C shell
The C shell (csh or the improved version, tcsh) is a Unix shell created by Bill Joy while he was a graduate student at University of California, Berkeley in the late 1970s. It has been widely distributed, beginning with the 2BSD release of the ...
implements this command in a different way.
Options
The following options are supported.
;name: Searches the PATH environmental variable for the name given
Exit Status
This command returns the following exit values:
;0: Successful completion
;1: An Error occurred
Examples
$ hash
Print the hash table.
$ hash cat
Searches for command cat in the path specified by PATH environmental variable; if found, adds it to the hash.
See also
*
find
*
Unix shell
A Unix shell is a Command-line_interface#Command-line_interpreter, command-line interpreter or shell (computing), shell that provides a command line user interface for Unix-like operating systems. The shell is both an interactive command languag ...
References
External links
*
*
{{Unix commands
Unix SUS2008 utilities
IBM i Qshell commands