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 Documented in Volume 1 of the UNIX Programmers Manual.

 % last
  lists a record of all logins and logouts in reverse order.

 localnet	ttyj1	Wed Nov	6 11:10	still logged in
 wasson	ttyh4		Wed Nov	6 11:05 - 11:12	(00:06)
 hallh	ttyp1	cod	Wed Nov	6 10:58 - 11:06	(00:08)
 crabb	ttyp1	guppy	Wed Nov	6 10:01 - 10:04	(00:02)
 nelson	ttyh5		Wed Nov	6 10:01 - 10:22	(00:21)
 kemp	ttyha		Wed Nov	6 08:50	still logged in
 ...

 % last reboot
  gives a rough indication of time since last reboot.

 wtmp begins Sat Nov  2 08:48

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