getting back a file after you delete it - HELP!!!!!

[jay dubb]

   I am posting this for a friend of mine who doesn't have access
to USENET, so please respond directly to mlevin at jade.tufts.edu.

   I am at wit's end... I have Ultrix 4.1 running on a VaxStation
II/RC. I had a file, called a.doc. By mistake, I did "cp b.doc a.doc".
I am now desperate to get a.doc back. Is this possible? I know on DOS
PCs, there is a utility to get back deleted files (provided you
haven't actually written anything over them yet).  What can I do to
get as much of a.doc back as possible? I REALLY REALLY need it back!
Please help.

					Mike Levin
(mlevin at jade.tufts.edu)