who man page on 4.4BSD

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WHO(1)			  BSD General Commands Manual			WHO(1)

     who — display who is logged in

     who [am I] [file]

     The utility who displays a list of all users currently logged on, showing
     for each user the login name, tty name, the date and time of login, and
     hostname if not local.

     Available options:

     am I  Returns the invoker's real user name.

     file  By default, who gathers information from the file /var/run/utmp.
	   An alternate file may be specified which is usually /var/run/wtmp
	   (or /var/run/wtmp.[0-6] depending on site policy as wtmp can grow
	   quite large and daily versions may or may not be kept around after
	   compression by ac(8)).  The wtmp file contains a record of every
	   login, logout, crash, shutdown and date change since wtmp was last
	   truncated or created.

     If /var/log/wtmp is being used as the file, the user name may be empty or
     one of the special characters '|', '}' and '~'.  Logouts produce an out‐
     put line without any user name.  For more information on the special
     characters, see utmp(5).


     last(1), users(1), getuid(2), utmp(5)

     A who command appeared in Version 6 AT&T UNIX.

BSD			       December 30, 1993			   BSD

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