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