Only recently I requested a colleague of mine edit the startup-sequence of a SuSE Linux box to include a program I'd been installing. Needless to say I was met with a blank stare.
Sometimes if I'm looking for pictures on my windows box I do a search for *.iff.
Occasionally if a unix box is giving me grief it's hard to resist trying an avail flush.
What old amiga habits do you find hard to shake off in your IT work?