prot -- protect file

syntax:  prot <pathname> [-r] [-w] [-n] [-d]

ex:      prot this
         prot ? -rwn

Allows only the specified rights to a file:  r)ead, w)rite, 
ren)ame, and d)elete.  Wildcards are allowed.

   prot x -r      =       lock x
   prot x -rwnd   =       unlock x

(see also:  lock, unlock)