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 com-
       mand.  The -s option causes unhash to remove suffix aliases.  The
       -f  option  causes  unhash to remove shell functions.  The -d op-
       tions 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.