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 Ns : 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.Bl -tag -width x -compact 70.It + 71User is accepting messages. 72.It \&- 73User is not accepting messages. 74.It ? 75An error occurred. 76.El 77.It Fl u 78Show idle time for each user in hours and minutes as 79.Ql hh:mm , 80.Ql \&. 81if the user has been idle less that a minute and 82.Ql old 83if the user has been idle more than 24 hours. 84.It Cm am I 85Equivalent to 86.Fl m . 87.El 88.Pp 89By default, 90.Nm 91gathers information from the file 92.Pa /var/run/utmp . 93An alternate 94.Ar file 95may be specified which is usually 96.Pa /var/log/wtmp 97(or 98.Pa /var/log/wtmp.[0-6] 99depending on site policy as 100.Pa wtmp 101can grow quite large and daily versions may or may not 102be kept around after compression by 103.Xr ac 8 ) . 104The 105.Pa wtmp 106file contains a record of every login, logout, 107crash, shutdown and date change 108since 109.Pa wtmp 110was last truncated or 111created. 112.Pp 113If 114.Pa /var/log/wtmp 115is being used as the file, the user name may be empty 116or one of the special characters '|', '}' and '~'. Logouts produce 117an output line without any user name. For more information on the 118special characters, see 119.Xr utmp 5 . 120.Sh FILES 121.Bl -tag -width /var/log/wtmp.[0-6] -compact 122.It Pa /var/run/utmp 123.It Pa /var/log/wtmp 124.It Pa /var/log/wtmp.[0-6] 125.El 126.Sh DIAGNOSTICS 127.Ex -std 128.Sh SEE ALSO 129.Xr last 1 , 130.Xr users 1 , 131.Xr w 1 , 132.Xr utmp 5 133.Sh STANDARDS 134The 135.Nm 136utility conforms to 137.St -p1003.1-2001 . 138.Sh HISTORY 139A 140.Nm 141command appeared in 142.At v1 . 143