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Power tools

Checking who is logged in

You can use the who command to find out who is logged in, where they are logged in, and when they logged in. To use who, simply type who and press <Enter>:

   $ who
   backup     tty01        Jun 28 07:56
   perry      tty002       Jun 28 09:14
   theresma   tty003       Jun 28 08:49
   joseph     tty004       Jun 28 11:20
   liz        tty005       Jun 28 09:02
   cecile     tty006       Jun 28 10:06
   kate       tty007       Jun 28 09:35
   liane      tty009       Jun 28 09:41
   bridget    tty011       Jun 28 08:06
   sarah      tty001       Jun 28 08:06
   nigel      tty008       Jun 28 08:02
   gudrun     tty010       Jun 28 08:09
   susannah   tty013       Jun 28 09:14
The tty number that follows each person's login name tells which terminal they logged in on. If people are logged in on several terminals at once, they appear once per login in the who listing.

You can find out when someone logged in by searching for their login name using grep:

   $ who | grep sarah
   sarah      tty001       Jun 28 08:06

Next topic: Finding out more information about a user
Previous topic: grep ``foo'' afile

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SCO OpenServer Release 6.0.0 -- 03 June 2005