unhash [ -adfms ] name ...
       Remove the element named name from an internal hash table.  The de-
       fault  is  remove elements from the command hash table.  The -a op-
       tion causes unhash to remove regular or global aliases;  note  when
       removing  a global aliases that the argument must be quoted to pre-
       vent it from being expanded before being  passed  to  the  command.
       The  -s  option causes unhash to remove suffix aliases.  The -f op-
       tion 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 ele-
       ments  of  the corresponding hash table with matching names will be
       removed.

unalias [ -ams ] name ...
       Removes  aliases.  This command works the same as unhash -a, except
       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.
