who(1) [freebsd man page]

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

NAME

     who -- display who is on the system

SYNOPSIS

     who [-abHmqsTu] [am I] [file]

DESCRIPTION

     The who utility displays information about currently logged in users.  By default, this includes the login name, tty name, date and time of
     login and remote hostname if not local.

     The options are as follows:

     -a      Equivalent to -bTu, with the exception that output is not restricted to the time and date of the last system reboot.

     -b      Write the time and date of the last system reboot.

     -H      Write column headings above the output.

     -m      Show information about the terminal attached to standard input only.

     -q      ``Quick mode'': List the names and number of logged in users in columns.  All other command line options are ignored.

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

     -T      Indicate whether each user is accepting messages.	One of the following characters is written:

	     +	User is accepting messages.
	     -	User is not accepting messages.
	     ?	An error occurred.

     -u      Show idle time for each user in hours and minutes as hh:mm, '.' if the user has been idle less than a minute, and ``old'' if the user
	     has been idle more than 24 hours.

     am I    Equivalent to -m.

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

     If /var/log/utx.log 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 getutxent(3).

ENVIRONMENT

     The COLUMNS, LANG, LC_ALL and LC_TIME environment variables affect the execution of who as described in environ(7).

FILES

     /var/run/utx.active
     /var/log/utx.log
     /var/log/utx.log.[0-6]

EXIT STATUS

     The who utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     last(1), users(1), w(1), getutxent(3)

STANDARDS

     The who utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     A who command appeared in Version 1 AT&T UNIX.

BSD
								 February 11, 2012							       BSD

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 windowing 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 ver-
	   sions 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