Episode 31 of Linux in the Shell discuses the use of the who command. The who command does more than just identify who is logged into a system. Who is coupled with init and will produce statistical information about the system since the last boot. Make sure you visit the entry on http://www.linuxintheshell.org to get the full write up of the who command and for further information in the bibliography on topics discussed.
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HPR - HPR1262: LiTS 031: who
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