       unhash [ -adfm ] 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  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 corre-
              sponding hash table with  matching  names  will  be
              removed.
