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.\" $FreeBSD$ 34.\" 35.Dd May 8, 2002 36.Dt WHO 1 37.Os 38.Sh NAME 39.Nm who 40.Nd display who is on the system 41.Sh SYNOPSIS 42.Nm 43.Op Fl HmqsTu 44.Op Cm am I 45.Op Ar file 46.Sh DESCRIPTION 47The 48.Nm 49utility displays information about currently logged in users. 50By default, this includes the login name, tty name, date and time of login and 51remote hostname if not local. 52.Pp 53The options are as follows: 54.Bl -tag -width indent 55.It Fl H 56Write column headings above the output. 57.It Fl m 58Show information about the terminal attached to standard input only. 59.It Fl q 60.Dq "Quick mode" : 61List the names and number of logged in users in columns. 62All other command line options are ignored. 63.It Fl s 64Show the name, line and time fields only. 65This is the default. 66.It Fl T 67Indicate whether each user is accepting messages. 68One of the following characters is written: 69.Pp 70.Bl -tag -width 1n -compact 71.It Li + 72User is accepting messages. 73.It Li \&- 74User is not accepting messages. 75.It Li \&? 76An error occurred. 77.El 78.It Fl u 79Show idle time for each user in hours and minutes as 80.Ar hh Ns : Ns Ar mm , 81.Ql \&. 82if the user has been idle less that a minute, and 83.Dq Li old 84if the user has been idle more than 24 hours. 85.It Cm am I 86Equivalent to 87.Fl m . 88.El 89.Pp 90By default, 91.Nm 92gathers information from the file 93.Pa /var/run/utmp . 94An alternate 95.Ar file 96may be specified which is usually 97.Pa /var/log/wtmp 98(or 99.Pa /var/log/wtmp.[0-6] 100depending on site policy as 101.Pa wtmp 102can grow quite large and daily versions may or may not 103be kept around after compression by 104.Xr ac 8 ) . 105The 106.Pa wtmp 107file contains a record of every login, logout, 108crash, shutdown and date change 109since 110.Pa wtmp 111was last truncated or 112created. 113.Pp 114If 115.Pa /var/log/wtmp 116is being used as the file, the user name may be empty 117or one of the special characters '|', '}' and '~'. 118Logouts produce 119an output line without any user name. 120For more information on the 121special characters, see 122.Xr utmp 5 . 123.Sh ENVIRONMENT 124The 125.Ev COLUMNS , LANG , LC_ALL 126and 127.Ev LC_TIME 128environment variables affect the execution of 129.Nm 130as described in 131.Xr environ 7 . 132.Sh FILES 133.Bl -tag -width /var/log/wtmp.[0-6] -compact 134.It Pa /var/run/utmp 135.It Pa /var/log/wtmp 136.It Pa /var/log/wtmp.[0-6] 137.El 138.Sh EXIT STATUS 139.Ex -std 140.Sh SEE ALSO 141.Xr last 1 , 142.Xr users 1 , 143.Xr w 1 , 144.Xr utmp 5 145.Sh STANDARDS 146The 147.Nm 148utility conforms to 149.St -p1003.1-2001 . 150.Sh HISTORY 151A 152.Nm 153command appeared in 154.At v1 . 155