>what ? Hi Delbert, Wow, I can't believe you have a funky .mil email address and you obviously like UNIX but you haven't read this book. Cliff Stoll is a sysadmin at Berkely who tracked down a German cracker working for the KGB. The "Cuckoos Egg" is a book he wrote about the case. It's a great story (and all true). One of the clues that leads to the guy is that he keeps using ps -ef on BSD based systems, this makes Stoll believe the intruder is on the east coast of the US (where thanks to AT&T, Sys V machines were at the time predominant). I have a spare copy but I think thats a bit too far to send. It's worth checking out, a couple of people I've spoken to here read it at university as part of their network security classes. Best regards. Ben Ben Lewis Lucent Technologies SIS Consulting A. Gossetlaan 54, 1702 Brussels, Belgium