hash(1)								       hash(1)

NAME    [Toc]    [Back]

     hash - remember or	report utility locations

SYNOPSIS    [Toc]    [Back]

     hash [utility...]

     hash -r

DESCRIPTION    [Toc]    [Back]

     The hash utility affects the way the current shell	environment remembers
     the locations of utilities	found as described in Command Search and
     Execution . Depending on the arguments specified, it adds utility
     locations to its list of remembered locations or it purges	the contents
     of	the list. When no arguments are	specified, it reports on the contents
     of	the list.

     Utilities provided	as built-ins to	the shell are not reported by hash.

OPTIONS    [Toc]    [Back]

     The hash utility supports the XBD specification, Utility Syntax
     Guidelines.

     The following option is supported:

     -r	 Forget	all previously remembered utility locations.

OPERANDS    [Toc]    [Back]

     The following operand is supported:

     utility   The name	of a utility to	be searched for	and added to the list
	       of remembered locations.	If utility contains one	or more
	       slashes,	the results are	unspecified.

ENVIRONMENT VARIABLES    [Toc]    [Back]

     The following environment variables affect	the execution of hash:

     PATH   Determine the location of utility, as described in the XBD
	    specification, Environment Variables .

STDOUT    [Toc]    [Back]

     The standard output of hash is used when no arguments are specified.  Its
     format is unspecified, but	includes the pathname of each utility in the
     list of remembered	locations for the current shell	environment.  This
     list consists of those utilities named in previous	hash invocations that
     have been invoked,	and may	contain	those invoked and found	through	the
     normal command search process.

EXIT STATUS    [Toc]    [Back]

     The following exit	values are returned:






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hash(1)								       hash(1)



     0	 Successful completion.

     >0	 An error occurred.

APPLICATION USAGE    [Toc]    [Back]

     Since hash	affects	the current shell execution environment, it is always
     provided as a shell regular built-in. If it is called in a	separate
     utility execution environment, such as one	of the following:

	  nohup	hash -r	find . -type f | xargs hash

     it	will not affect	the command search process of the caller's
     environment.

     The hash utility may be implemented as an alias, for example, alias -t -,
     in	which case utilities found through normal command search will not be
     listed by the hash	command.

     The effects of hash -r can	also be	achieved portably by resetting the
     value of PATH; in the simplest form, this can be:

	  PATH="$PATH"

     The use of	hash with utility names	is unnecessary for most	applications,
     but may provide a performance improvement on a few	implementations;
     normally, the hashing process is included by default.

SEE ALSO    [Toc]    [Back]

     sh(1)


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