WHO(1)                     OpenBSD Reference Manual                     WHO(1)

NAME
     who - display who is logged in



SYNOPSIS
     who [-mTu] [file]
     who am i

DESCRIPTION
     The who utility 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.

     The options are as follows:

     -m    Only print information about the current terminal.  This is the
           POSIX way of saying who am i.

     -q    (Quick.) List only the names and the number of users currently
           logged on. When this option is used, all other options are ignored.

     -T    Print a character after the user name indicating the state of the
           terminal line: `+' if the terminal is writable; `-' if it is not;
           and `?' if a bad line is encountered.

     -u    Print the idle time for each user.

     -H    Write column headings above the regular output.

     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/log/wtmp (or
           /var/log/wtmp.[0-6] depending on site policy as wtmp can grow quite
           large and daily versions may or may not be kept around after com-
           pression by ac(8)).  The wtmp file contains a record of every lo-
           gin, 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).

FILES
     /var/run/utmp
     /var/log/wtmp
     /var/log/wtmp.[0-6]

SEE ALSO
     last(1),  mesg(1),  users(1),  getuid(2),  utmp(5)

HISTORY
     A who utility appeared in Version 6 AT&T UNIX.

STANDARDS
     The who utility is expected to conform to IEEE Std1003.2-1992
     (``POSIX.2'').

OpenBSD 2.6                    December 6, 1994                              1