NAME    [Toc]    [Back]

     who - display who is logged in

SYNOPSIS    [Toc]    [Back]

     who [-HmqTu] [file]
     who am i

DESCRIPTION    [Toc]    [Back]

     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:

     -H      Write column headings above the regular output.

     -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.

     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
 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 output
 line without any user name.  For more information on the
special
     characters, see utmp(5).

FILES    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     The  who  utility  is  expected  to  conform  to  IEEE   Std
1003.2-1992
     (``POSIX.2'').

HISTORY    [Toc]    [Back]

     A who utility appeared in Version 3 AT&T UNIX.

OpenBSD      3.6                         December     6,     1994