.\" $NetBSD: who.1,v 1.22 2007/01/18 00:15:05 wiz Exp $ .\" .\" Copyright (c) 1986, 1991, 1993 .\" The Regents of the University of California. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)who.1 8.2 (Berkeley) 12/30/93 .\" .Dd January 17, 2007 .Dt WHO 1 .Os .Sh NAME .Nm who .Nd display who is logged in .Sh SYNOPSIS .Nm .Op Fl abdHlmpqrsTtu .Op Ar file .Nm .Ar am i .Sh DESCRIPTION The .Nm 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. .Pp Available options: .Pp .Bl -tag -width file .It Fl a Same as .Fl bdlprTtu . .It Fl b Time of last system boot. .It Fl d Print dead processes. .It Fl H Write column headings above the regular output. .It Fl l Print system login processes (unsupported). .It Fl m Only print information about the current terminal. This is the .Tn POSIX way of saying .Nm .Ar am i . .It Fl p Print active processes spawned by .Xr launchd 8 (unsupported). .It Fl q .Dq Quick mode : List only the names and the number of users currently logged on. When this option is used, all other options are ignored. .It Fl r Print the current runlevel. This is meaningless on Mac OS X. .It Fl s List only the name, line and time fields. This is the default. .It Fl T Print a character after the user name indicating the state of the terminal line: .Sq + if the terminal is writable; .Sq - if it is not; and .Sq \&? if a bad line is encountered. .It Fl t Print last system clock change (unsupported). .It Fl u Print the idle time for each user, and the associated process ID. .It Ar \&am I Returns the invoker's real user name. .It Ar file By default, .Nm gathers information from the file .Pa /var/run/utmpx . An alternative .Ar file may be specified. .El .Sh FILES .Bl -tag -width /var/run/utmpx -compact .It Pa /var/run/utmpx .El .Sh SEE ALSO .Xr last 1 , .Xr mesg 1 , .Xr users 1 , .Xr getuid 2 , .Xr utmpx 5 .Sh STANDARDS The .Nm utility conforms to .St -p1003.1-2001 . .Sh HISTORY A .Nm utility appeared in .At v6 .