1.\" Copyright (c) 1986, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)who.1 8.2 (Berkeley) 12/30/93 33.\" $FreeBSD: src/usr.bin/who/who.1,v 1.7.2.5 2003/02/24 23:04:40 trhodes Exp $ 34.\" $DragonFly: src/usr.bin/who/who.1,v 1.2 2003/06/17 04:29:33 dillon Exp $ 35.\" 36.Dd May 8, 2002 37.Dt WHO 1 38.Os 39.Sh NAME 40.Nm who 41.Nd display who is on the system 42.Sh SYNOPSIS 43.Nm 44.Op Fl HmqsTu 45.Op Cm am I 46.Op Ar file 47.Sh DESCRIPTION 48The 49.Nm 50utility displays information about currently logged in users. 51By default, this includes the login name, tty name, date and time of login and 52remote hostname if not local. 53.Pp 54The options are as follows: 55.Bl -tag -width indent 56.It Fl H 57Write column headings above the output. 58.It Fl m 59Show information about the terminal attached to standard input only. 60.It Fl q 61.Dq "Quick mode" : 62List the names and number of logged in users in columns. 63All other command line options are ignored. 64.It Fl s 65Show the name, line and time fields only. 66This is the default. 67.It Fl T 68Indicate whether each user is accepting messages. 69One of the following characters is written: 70.Pp 71.Bl -tag -width 1n -compact 72.It Li + 73User is accepting messages. 74.It Li \&- 75User is not accepting messages. 76.It Li \&? 77An error occurred. 78.El 79.It Fl u 80Show idle time for each user in hours and minutes as 81.Ar hh Ns : Ns Ar mm , 82.Ql \&. 83if the user has been idle less that a minute, and 84.Dq Li old 85if the user has been idle more than 24 hours. 86.It Cm am I 87Equivalent to 88.Fl m . 89.El 90.Pp 91By default, 92.Nm 93gathers information from the file 94.Pa /var/run/utmp . 95An alternate 96.Ar file 97may be specified which is usually 98.Pa /var/log/wtmp 99(or 100.Pa /var/log/wtmp.[0-6] 101depending on site policy as 102.Pa wtmp 103can grow quite large and daily versions may or may not 104be kept around after compression by 105.Xr ac 8 ) . 106The 107.Pa wtmp 108file contains a record of every login, logout, 109crash, shutdown and date change 110since 111.Pa wtmp 112was last truncated or 113created. 114.Pp 115If 116.Pa /var/log/wtmp 117is being used as the file, the user name may be empty 118or one of the special characters '|', '}' and '~'. Logouts produce 119an output line without any user name. For more information on the 120special characters, see 121.Xr utmp 5 . 122.Sh ENVIRONMENT 123The 124.Ev COLUMNS , LANG , LC_ALL 125and 126.Ev LC_TIME 127environment variables affect the execution of 128.Nm 129as described in 130.Xr environ 7 . 131.Sh FILES 132.Bl -tag -width /var/log/wtmp.[0-6] -compact 133.It Pa /var/run/utmp 134.It Pa /var/log/wtmp 135.It Pa /var/log/wtmp.[0-6] 136.El 137.Sh DIAGNOSTICS 138.Ex -std 139.Sh SEE ALSO 140.Xr last 1 , 141.Xr users 1 , 142.Xr w 1 , 143.Xr utmp 5 144.Sh STANDARDS 145The 146.Nm 147utility conforms to 148.St -p1003.1-2001 . 149.Sh HISTORY 150A 151.Nm 152command appeared in 153.At v1 . 154