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 Oct 28, 2011 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 bHmqsTu 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 b 52Write the time and date of the last system reboot. 53.It Fl H 54Write column headings above the output. 55.It Fl m 56Show information about the terminal attached to standard input only. 57.It Fl q 58.Dq "Quick mode" : 59List the names and number of logged in users in columns. 60All other command line options are ignored. 61.It Fl s 62Show the name, line and time fields only. 63This is the default. 64.It Fl T 65Indicate whether each user is accepting messages. 66One of the following characters is written: 67.Pp 68.Bl -tag -width 1n -compact 69.It Li + 70User is accepting messages. 71.It Li \&- 72User is not accepting messages. 73.It Li \&? 74An error occurred. 75.El 76.It Fl u 77Show idle time for each user in hours and minutes as 78.Ar hh Ns : Ns Ar mm , 79.Ql \&. 80if the user has been idle less that a minute, and 81.Dq Li old 82if the user has been idle more than 24 hours. 83.It Cm am I 84Equivalent to 85.Fl m . 86.El 87.Pp 88By default, 89.Nm 90gathers information from the file 91.Pa /var/run/utx.active . 92An alternate 93.Ar file 94may be specified which is usually 95.Pa /var/log/utx.log 96(or 97.Pa /var/log/utx.log.[0-6] 98depending on site policy as 99.Pa utx.log 100can grow quite large and daily versions may or may not 101be kept around after compression by 102.Xr ac 8 ) . 103The 104.Pa utx.log 105file contains a record of every login, logout, 106crash, shutdown and date change 107since 108.Pa utx.log 109was last truncated or 110created. 111.Pp 112If 113.Pa /var/log/utx.log 114is being used as the file, the user name may be empty 115or one of the special characters '|', '}' and '~'. 116Logouts produce 117an output line without any user name. 118For more information on the 119special characters, see 120.Xr getutxent 3 . 121.Sh ENVIRONMENT 122The 123.Ev COLUMNS , LANG , LC_ALL 124and 125.Ev LC_TIME 126environment variables affect the execution of 127.Nm 128as described in 129.Xr environ 7 . 130.Sh FILES 131.Bl -tag -width /var/log/utx.log.[0-6] -compact 132.It Pa /var/run/utx.active 133.It Pa /var/log/utx.log 134.It Pa /var/log/utx.log.[0-6] 135.El 136.Sh EXIT STATUS 137.Ex -std 138.Sh SEE ALSO 139.Xr last 1 , 140.Xr users 1 , 141.Xr w 1 , 142.Xr getutxent 3 143.Sh STANDARDS 144The 145.Nm 146utility conforms to 147.St -p1003.1-2001 . 148.Sh HISTORY 149A 150.Nm 151command appeared in 152.At v1 . 153