.\" 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. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. 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 .\" $FreeBSD: src/usr.bin/who/who.1,v 1.16 2004/07/02 22:22:34 ru Exp $ .\" .Dd May 8, 2002 .Dt WHO 1 .Os .Sh NAME .Nm who .Nd display who is on the system .Sh SYNOPSIS .Nm .Op Fl HmqsTu .Op Cm am I .Op Ar file .Sh DESCRIPTION The .Nm 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. .Pp The options are as follows: .Bl -tag -width indent .It Fl H Write column headings above the output. .It Fl m Show information about the terminal attached to standard input only. .It Fl q .Dq "Quick mode" : List the names and number of logged in users in columns. All other command line options are ignored. .It Fl s Show the name, line and time fields only. This is the default. .It Fl T Indicate whether each user is accepting messages. One of the following characters is written: .Pp .Bl -tag -width 1n -compact .It Li + User is accepting messages. .It Li \&- User is not accepting messages. .It Li \&? An error occurred. .El .It Fl u Show idle time for each user in hours and minutes as .Ar hh Ns : Ns Ar mm , .Ql \&. if the user has been idle less that a minute, and .Dq Li old if the user has been idle more than 24 hours. .It Cm am I Equivalent to .Fl m . .El .Pp By default, .Nm gathers information from the file .Pa /var/run/utmp . An alternate .Ar file may be specified which is usually .Pa /var/log/wtmp (or .Pa /var/log/wtmp.[0-6] depending on site policy as .Pa wtmp can grow quite large and daily versions may or may not be kept around after compression by .Xr ac 8 ) . The .Pa wtmp file contains a record of every login, logout, crash, shutdown and date change since .Pa wtmp was last truncated or created. .Pp If .Pa /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 .Xr utmp 5 . .Sh ENVIRONMENT The .Ev COLUMNS , LANG , LC_ALL and .Ev LC_TIME environment variables affect the execution of .Nm as described in .Xr environ 7 . .Sh FILES .Bl -tag -width /var/log/wtmp.[0-6] -compact .It Pa /var/run/utmp .It Pa /var/log/wtmp .It Pa /var/log/wtmp.[0-6] .El .Sh DIAGNOSTICS .Ex -std .Sh SEE ALSO .Xr last 1 , .Xr users 1 , .Xr w 1 , .Xr utmp 5 .Sh STANDARDS The .Nm utility conforms to .St -p1003.1-2001 . .Sh HISTORY A .Nm command appeared in .At v1 .