who(1) [redhat man page]

WHO(1)									FSF								    WHO(1)

NAME

       who - show who is logged on

SYNOPSIS

       who [OPTION]... [ FILE | ARG1 ARG2 ]

DESCRIPTION

       -a, --all
	      same as -b -d --login -p -r -t -T -u

       -b, --boot
	      time of last system boot

       -d, --dead
	      print dead processes

       -H, --heading
	      print line of column headings

       -i, --idle
	      add idle time as HOURS:MINUTES, . or old (deprecated, use -u)

       --login
	      print system login processes (equivalent to SUS -l)

       -l, --lookup
	      attempt to canonicalize hostnames via DNS (-l is deprecated, use --lookup)

       -m     only hostname and user associated with stdin

       -p, --process
	      print active processes spawned by init

       -q, --count
	      all login names and number of users logged on

       -r, --runlevel
	      print current runlevel

       -s, --short
	      print only name, line, and time (default)

       -t, --time
	      print last system clock change

       -T, -w, --mesg
	      add user's message status as +, - or ?

       -u, --users
	      list users logged in

       --message
	      same as -T

       --writable
	      same as -T

       --help display this help and exit

       --version
	      output version information and exit

       If  FILE is not specified, use /var/run/utmp.  /var/log/wtmp as FILE is common.	If ARG1 ARG2 given, -m presumed: `am i' or `mom likes' are
       usual.

AUTHOR

       Written by Joseph Arceneaux, David MacKenzie, and Michael Stone.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full  documentation  for who is maintained as a Texinfo manual.  If the info and who programs are properly installed at your site, the
       command

	      info who

       should give you access to the complete manual.

who (coreutils) 4.5.3						   February 2003							    WHO(1)

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