unhash [ -adfms ] name ...
       Remove the element named name from an internal hash table.   The
       default  is remove elements from the command hash table.  The -a
       option causes unhash to remove regular or global  aliases;  note
       when  removing a global aliases that the argument must be quoted
       to prevent it from being expanded before  being  passed  to  the
       command.   The -s option causes unhash to remove suffix aliases.
       The -f option causes unhash to remove shell functions.   The  -d
       options  causes  unhash  to remove named directories.  If the -m
       flag is given the arguments are taken  as  patterns  (should  be
       quoted)  and  all  elements of the corresponding hash table with
       matching names will be removed.

unalias [ -ams ] name ...
       Removes aliases.  This command works the same as unhash -a,  ex-
       cept  that  the -a option removes all regular or global aliases,
       or with -s all suffix aliases: in this case  no  name  arguments
       may  appear.   The options -m (remove by pattern) and -s without
       -a (remove listed suffix aliases) behave as for unhash -a.  Note
       that the meaning of -a is different between unalias and unhash.

unfunction
       Same as unhash -f.