hash - Remembers or reports utility locations
Interfaces documented on this reference page conform to industry standards as follows:
hash: XPG4, XPG4-UNIX
Refer to the
reference page for more information
about industry standards and associated tags.
Forgets all previously remembered utility locations.
The name of a utility to be searched for and added to the
list of remembered locations. If
one or more slashes, the results are unspecified.
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,
the contents of the list. This list consists of those utilities named in
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.
The use of
names is unnecessary for most applications, but may provide
a performance improvement.
The effects of
can also be achieved by resetting the value of
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
The following exit values are returned:
An error occurred.
The following environment variables affect the execution of
Provides a default value for the internationalization variables
that are unset or null. If
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
Determines the location of
Commands: command(1), type(1)