Content-type: text/html Man page of hash

hash

Section: User Commands (1)
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NAME

hash - Remembers or reports utility locations  

SYNOPSIS

hash [utility]

hash -r


 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

hash:  XPG4, XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.
 

OPTIONS

Forgets all previously remembered utility locations.
 

OPERANDS

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.
 

DESCRIPTION

The hash utility affects the way the current shell environment remembers the locations of utilities found. 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, hash reports on the contents of the list. This list consists of those utilities named in previous hash invocations that have been invoked, and those invoked and found through the normal command search process. This list includes the path name of each utility in the list of remembered locations for the current shell environment.
 

NOTES

The use of hash with utility names is unnecessary for most applications, but may provide a performance improvement. The effects of hash -r can also be achieved by resetting the value of PATH.
 

RESTRICTIONS

If hash is called in a separate utility execution environment, such as one of the following it will not affect the command search process of the caller's environment. nohup hash -r find . -type f | xargs hash Utilities provided as built-ins to the shell are not reported by hash.
 

EXIT STATUS

The following exit values are returned: Successful completion. An error occurred.
 

ENVIRONMENT VARIABLES

The following environment variables affect the execution of hash: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization variables contains an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multibyte characters in arguments). Determines the locale that should be used to affect the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. Determines the location of name.
 

SEE ALSO

Commands:  command(1), type(1)

Standards:  standards(5)


 

Index

NAME
SYNOPSIS
STANDARDS
OPTIONS
OPERANDS
DESCRIPTION
NOTES
RESTRICTIONS
EXIT STATUS
ENVIRONMENT VARIABLES
SEE ALSO

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Time: 02:42:58 GMT, October 02, 2010