LXer: Monitoring User Activity with psacct or acct
 

Published at LXer:

An excellent program for monitoring users and applications is psacct. This program will work in the background of your system recording what all users are doing on your system as well as the resources that are being consumed. I originally started using this program when a client asked for a way to monitor his developers and what they were doing on the servers that they were working on.

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