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 December 30, 1993 36.Dt WHO 1 37.Os 38.Sh NAME 39.Nm who 40.Nd display who is logged in 41.Sh SYNOPSIS 42.Nm 43.Ar am I 44.Nm 45.Op Ar file 46.Sh DESCRIPTION 47The 48.Nm 49utility displays 50a list of all users currently logged on, showing for each user 51the login name, 52tty name, the date and time of login, and hostname if not local. 53.Pp 54Available options: 55.Pp 56.Bl -tag -width file 57.It Ar \&am I 58Returns the invoker's real user name. 59.It Ar file 60By default, 61.Nm 62gathers information from the file 63.Pa /var/run/utmp . 64An alternate 65.Ar file 66may be specified which is usually 67.Pa /var/run/wtmp 68(or 69.Pa /var/run/wtmp.[0-6] 70depending on site policy as 71.Pa wtmp 72can grow quite large and daily versions may or may not 73be kept around after compression by 74.Xr ac 8 ) . 75The 76.Pa wtmp 77file contains a record of every login, logout, 78crash, shutdown and date change 79since 80.Pa wtmp 81was last truncated or 82created. 83.El 84.Pp 85If 86.Pa /var/log/wtmp 87is being used as the file, the user name may be empty 88or one of the special characters '|', '}' and '~'. Logouts produce 89an output line without any user name. For more information on the 90special characters, see 91.Xr utmp 5 . 92.Sh FILES 93.Bl -tag -width /var/log/wtmp.[0-6] -compact 94.It Pa /var/run/utmp 95.It Pa /var/log/wtmp 96.It Pa /var/log/wtmp.[0-6] 97.El 98.Sh SEE ALSO 99.Xr last 1 , 100.Xr users 1 , 101.Xr getuid 2 , 102.Xr utmp 5 103.Sh HISTORY 104A 105.Nm 106command appeared in 107.At v1 . 108