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 1.3 2004/10/29 17:09:09 liamfoy Exp $ 35.\" 36.Dd October 25, 2004 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 bHmqsTu 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 b 57Show date and time of last reboot. 58.It Fl H 59Write column headings above the output. 60.It Fl m 61Show information about the terminal attached to standard input only. 62.It Fl q 63.Dq "Quick mode" : 64List the names and number of logged in users in columns. 65All other command line options are ignored. 66.It Fl s 67Show the name, line and time fields only. 68This is the default. 69.It Fl T 70Indicate whether each user is accepting messages. 71One of the following characters is written: 72.Pp 73.Bl -tag -width 1n -compact 74.It Li + 75User is accepting messages. 76.It Li \&- 77User is not accepting messages. 78.It Li \&? 79An error occurred. 80.El 81.It Fl u 82Show idle time for each user in hours and minutes as 83.Ar hh Ns : Ns Ar mm , 84.Ql \&. 85if the user has been idle less that a minute, and 86.Dq Li old 87if the user has been idle more than 24 hours. 88.It Cm am I 89Equivalent to 90.Fl m . 91.El 92.Pp 93By default, 94.Nm 95gathers information from the file 96.Pa /var/run/utmp . 97An alternate 98.Ar file 99may be specified which is usually 100.Pa /var/log/wtmp 101(or 102.Pa /var/log/wtmp.[0-6] 103depending on site policy as 104.Pa wtmp 105can grow quite large and daily versions may or may not 106be kept around after compression by 107.Xr ac 8 ) . 108The 109.Pa wtmp 110file contains a record of every login, logout, 111crash, shutdown and date change 112since 113.Pa wtmp 114was last truncated or 115created. 116.Pp 117If 118.Pa /var/log/wtmp 119is being used as the file, the user name may be empty 120or one of the special characters '|', '}' and '~'. Logouts produce 121an output line without any user name. For more information on the 122special characters, see 123.Xr utmp 5 . 124.Sh ENVIRONMENT 125The 126.Ev COLUMNS , LANG , LC_ALL 127and 128.Ev LC_TIME 129environment variables affect the execution of 130.Nm 131as described in 132.Xr environ 7 . 133.Sh FILES 134.Bl -tag -width /var/log/wtmp.[0-6] -compact 135.It Pa /var/run/utmp 136.It Pa /var/log/wtmp 137.It Pa /var/log/wtmp.[0-6] 138.El 139.Sh EXIT STATUS 140.Ex -std 141.Sh SEE ALSO 142.Xr last 1 , 143.Xr users 1 , 144.Xr w 1 , 145.Xr utmp 5 146.Sh STANDARDS 147The 148.Nm 149utility conforms to 150.St -p1003.1-2001 . 151.Sh HISTORY 152A 153.Nm 154command appeared in 155.At v1 . 156