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User Commands hash(1)
NAME
hash, rehash, unhash, hashstat - evaluate the internal hash
table of the contents of directories
SYNOPSIS
/usr/bin/hash [utility]
/usr/bin/hash [-r]
sh
hash [-r] [name...]
csh
rehash
unhash
hashstat
ksh
hash [name...]
hash [-r]
DESCRIPTION
/usr/bin/hash
The /usr/bin/hash utility affects the way the current shell
environment remembers the locations of utilities found.
Depending on the arguments specified, it adds utility loca-
tions 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. The -r option causes
the shell to forget all remembered locations.
Utilities provided as built-ins to the shell are not
reported by hash.
sh
For each name, the location in the search path of the com-
mand specified by name is determined and remembered by the
shell. The -r option to the hash built-in causes the shell
to forget all remembered locations. If no arguments are
given, hash provides information about remembered commands.
The Hits column of output is the number of times a command
has been invoked by the shell process. The Cost column of
output is a measure of the work required to locate a command
in the search path. If a command is found in a "relative"
directory in the search path, after changing to that direc-
tory, the stored location of that command is recalculated.
Commands for which this will be done are indicated by an
asterisk (*) adjacent to the Hits information. Cost will be
incremented when the recalculation is done.
SunOS 5.10 Last change: 17 Jul 2002 1
User Commands hash(1)
csh
rehash recomputes the internal hash table of the contents of
directories listed in the path environmental variable to
account for new commands added.
unhash disables the internal hash table.
hashstat prints a statistics line indicating how effective
the internal hash table has been at locating commands (and
avoiding execs). An exec is attempted for each component of
the path where the hash function indicates a possible hit
and in each component that does not begin with a '/'.
ksh
For each name, the location in the search path of the com-
mand specified by name is determined and remembered by the
shell. The -r option to the hash built-in causes the shell
to forget all remembered locations. If no arguments are
given, hash provides information about remembered commands.
OPERANDS
The following operand is supported by hash:
utility The name of a utility to be searched for and
added to the list of remembered locations.
OUTPUT
The standard output of hash is used when no arguments are
specified. Its format is unspecified, but includes the path-
name 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.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment
variables that affect the execution of hash: LANG, LC_ALL,
LC_CTYPE, LC_MESSAGES, and NLSPATH.
PATH Determine the location of utility.
EXIT STATUS
The following exit values are returned by hash:
0 Successful completion.
SunOS 5.10 Last change: 17 Jul 2002 2
User Commands hash(1)
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
| Interface Stability | Standard |
|_____________________________|_____________________________|
SEE ALSO
csh(1), ksh(1), sh(1), attributes(5), environ(5), stan-
dards(5)
SunOS 5.10 Last change: 17 Jul 2002 3
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This page was generated on Wed Sep 12 11:24:55 GMT 2007
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