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
       Same as unhash -a.

unfunction
       Same as unhash -f.
