From: greg <eegreg@...>
Date: 2006-09-28T13:43:42+09:00
Subject: Re: how to determine if pipe is given

I wanted the ability to optionally pipe a file, but the program would
not require a file to be piped or given as an argument.  I guess the
answer is that this cannot be done.   I can only allow an optional file
argument, not a pipe.