http://freshmeat.net/projects/appcap/
Appcap is a tricky application for x86 Linux which allows an user with enough power (usually the superuser) on a machine to attach and redirect standard input and output of any application to his/her actual tty. In this way the superuser obtains an instrument for looking into ordinary users' sessions. This may be very useful if you suspect some of your users of doing nasty things from your machine.
These also look interesting
http://freshmeat.net/projects/ttysnoop/ http://freshmeat.net/projects/ttyrec/
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