psql command for bytea output

A few months ago, I blogged about the difficulty of getting psql to put 
a bytea datum into a file. See 
<http://people.planetpostgresql.org/andrew/index.php?/archives/196-Clever-trick-challenge.html>. 
Today I ran into the problem again, and it struck me that we could 
fairly easily have a new command to handle this, called, say, bcopy. So 
it would look like:
   \bcopy (select generate_bytea()) to foo.bin


Thoughts?


cheers

andrew