I occasionally run into weird, funny or surprising aspects of Unix and Unix-like Operating Systems. I'll try to post about those regularly because they're fun.
This one popped up on irc a few weeks ago; a google search suggests it's at least 6 months old. I have been unable to track the original source down.
The question is: if you input
echo cat | sed statement into your Unix
shell, what comes out? Can you predict it? If not, can you try it and
then explain it?