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NetBSD 6.1.5 - man page for who (netbsd section 1)

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

NAME
     who -- display who is logged in

SYNOPSIS
     who [-abdHlmqrstTuv] [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.

     Available options:

     -a    Same as --bdlprTtuv.

     -b    Time of last system boot.

     -d    Print dead processes.

     -H    Write column headings above the regular output.

     -l    Print system login processes.

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

     -p    Print active processes spawned by init(8).

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

     -r    Print the current runlevel.	Supported runlevels are:

	   d (DEATH)	    The system has halted.

	   s (SINGLE_USER)  The system is running in single user mode.

	   r (RUNCOM)	    The system is executing /etc/rc.

	   t (READ_TTYS)    The system is processing /etc/ttys.

	   m (MULTI_USER)   The system is running in multi-user mode.

	   T (CLEAN_TTYS)   The system is in the process of stopping processes associated with
			    terminal devices.

	   c (CATATONIA)    The system is in the process of shutting down and will not create new
			    processes.

     -s    List only the name, line and time fields.  This is the default.

     -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.

     -t    Print last system clock change.

     -u    Print the idle time for each user, and the associated process ID.

     -v    When printing of more information is requested with -u, this switch can be used to
	   also printed process termination signals, process exit status, session id for window-
	   ing and the type of the entry, see documentation of ut_type in getutxent(3).

     am I  Returns the invoker's real user name.

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

     If /var/log/wtmpx or /var/log/wtmp are 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
     /var/run/utmp
     /var/run/utmpx
     /var/log/wtmp
     /var/log/wtmp.[0-6]
     /var/log/wtmpx
     /var/log/wtmpx.[0-6]

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

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

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

BSD					 January 17, 2007				      BSD
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