/me digging in his own brain

AFAIR, it should be possible to configure a UNIX kernel to turn on system accounting: that way the kernel will log every call and, in particular, each and every command any user issues. By the way, it could slow down the OS on slow and/or busy machines.

I'm not sure I remember well, anyway. You really want to check what I'm saying.

Update: Aha! Got it! Check this!

Ciao!
--bronto

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The very nature of Perl to be like natural language--inconsistant and full of dwim and special cases--makes it impossible to know it all without simply memorizing the documentation (which is not complete or totally correct anyway).
--John M. Dlugosz