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BSD 2.11 - man page for who (bsd section 1)

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WHO(1)											   WHO(1)

       who - who is on the system

       who [ who-file ] [ am I ]

       Who,  without  an  argument,  lists the login name, terminal name, and login time for each
       current UNIX user.

       Without an argument, who examines the /var/run/utmp file to obtain its information.  If	a
       file  is  given,  that  file is examined.  Typically the given file will be /usr/adm/wtmp,
       which contains a record of all the logins since it was created.	Then  who  lists  logins,
       logouts,  and crashes since the creation of the wtmp file.  Each login is listed with user
       name, terminal name (with `/dev/' suppressed), and date and time.   When  an  argument  is
       given,  logouts	produce  a similar line without a user name.  Reboots produce a line with
       `x' in the place of the device name, and a fossil time indicative of when the system  went

       With  two  arguments,  as  in  `who  am I' (and also `who are you'), who tells who you are
       logged in as.


       getuid(2), utmp(5)

7th Edition				November 27, 1996				   WHO(1)
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