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hash [ -Ldfmrv ] [ name[=value] ] ...
hash can be used to directly modify the contents of the command
hash table, and the named directory hash table. Normally one
would modify these tables by modifying one's PATH (for the com-
mand hash table) or by creating appropriate shell parameters
(for the named directory hash table). The choice of hash table
to work on is determined by the -d option; without the option
the command hash table is used, and with the option the named
directory hash table is used.
A command name starting with a / is never hashed, whether by ex-
plicit use of the hash command or otherwise. Such a command is
always found by direct look up in the file system.
Given no arguments, and neither the -r or -f options, the se-
lected hash table will be listed in full.
The -r option causes the selected hash table to be emptied. It
will be subsequently rebuilt in the normal fashion. The -f op-
tion causes the selected hash table to be fully rebuilt immedi-
ately. For the command hash table this hashes all the absolute
directories in the PATH, and for the named directory hash table
this adds all users' home directories. These two options cannot
be used with any arguments.
The -m option causes the arguments to be taken as patterns
(which should be quoted) and the elements of the hash table
matching those patterns are printed. This is the only way to
display a limited selection of hash table elements.
For each name with a corresponding value, put `name' in the se-
lected hash table, associating it with the pathname `value'. In
the command hash table, this means that whenever `name' is used
as a command argument, the shell will try to execute the file
given by `value'. In the named directory hash table, this means
that `value' may be referred to as `~name'.
For each name with no corresponding value, attempt to add name
to the hash table, checking what the appropriate value is in the
normal manner for that hash table. If an appropriate value
can't be found, then the hash table will be unchanged.
The -v option causes hash table entries to be listed as they are
added by explicit specification. If has no effect if used with
-f.
If the -L flag is present, then each hash table entry is printed
in the form of a call to hash.
rehash Same as hash -r.
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