w — show Who is doing WhatSummary : w is part of the procps package. w shows information about the users currently on the machine, and their processes. The header shows, in this order, Current time, Uptime, No. of current users and Load averages for the past 1, 5, and 15 minutes. JCPU — The time used by all processes attached to the tty. It does not include past background jobs, but does include currently running background jobs. PCPU — The time used by the current process, named in the “WHAT”. Examples :
$ w -- Show header, users and processes Information. $ w bharathi -- Show information about bharathi (user) only. $ w -h -- Don't show header info. $ w -f -- Don't show FROM (remote hostname) field. $ w -s -- Short format. Don't show login, JCPU and PCPU times. $ w -u -- Ignores the user name while figuring out the currentprocess and CPU times of the current tty.
Read : man w