Rename

   Syntax: rename old-alias-name new-alias-name

   The rename command is used to rename an alias without altering
   its expansion value:

   db> add postmaster "system@thor.example.com"
   [Entry added to database]
   db> show postmaster
   Key         Value
   ----------  -----------------------------
   postmaster  system@thor.example.com
   [1 entry shown]
   db> rename postmaster post
   [1 entry renamed]
   db> show post
   Key         Value
   ----------  -----------------------------
   post        system@thor.example.com
   [1 entry shown]
   db>