1.\" $NetBSD: who.1,v 1.11 2002/09/30 11:09:17 grant Exp $ 2.\" 3.\" Copyright (c) 1986, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)who.1 8.2 (Berkeley) 12/30/93 35.\" 36.Dd December 6, 1994 37.Dt WHO 1 38.Os 39.Sh NAME 40.Nm who 41.Nd display who is logged in 42.Sh SYNOPSIS 43.Nm 44.Op Fl mTuH 45.Op Ar file 46.Nm "" 47.Ar am i 48.Sh DESCRIPTION 49The 50.Nm 51utility displays a list of all users currently logged on, showing for 52each user the login name, tty name, the date and time of login, and 53hostname if not local. 54.Pp 55Available options: 56.Pp 57.Bl -tag -width file 58.It Fl m 59Only print information about the current terminal. 60This is the 61.Tn POSIX 62way of saying 63.Nm 64.Ar am i . 65.It Fl T 66Print a character after the user name indicating the state of the 67terminal line: 68.Sq + 69if the terminal is writable; 70.Sq - 71if it is not; 72and 73.Sq ? 74if a bad line is encountered. 75.It Fl u 76Print the idle time for each user. 77.It Fl H 78Write column headings above the regular output. 79.It Ar \&am I 80Returns the invoker's real user name. 81.It Ar file 82By default, 83.Nm 84gathers information from the file 85.Pa /var/run/utmp . 86An alternative 87.Ar file 88may be specified which is usually 89.Pa /var/log/wtmp 90(or 91.Pa /var/log/wtmp.[0-6] 92depending on site policy as 93.Pa wtmp 94can grow quite large and daily versions may or may not 95be kept around after compression by 96.Xr ac 8 ) . 97The 98.Pa wtmp 99file contains a record of every login, logout, 100crash, shutdown and date change 101since 102.Pa wtmp 103was last truncated or 104created. 105.El 106.Pp 107If 108.Pa /var/log/wtmp 109is being used as the file, the user name may be empty 110or one of the special characters '|', '}' and '~'. 111Logouts produce an output line without any user name. 112For more information on the 113special characters, see 114.Xr utmp 5 . 115.Sh FILES 116.Bl -tag -width /var/log/wtmp.[0-6] -compact 117.It Pa /var/run/utmp 118.It Pa /var/log/wtmp 119.It Pa /var/log/wtmp.[0-6] 120.El 121.Sh SEE ALSO 122.Xr last 1 , 123.Xr mesg 1 , 124.Xr users 1 , 125.Xr getuid 2 , 126.Xr utmp 5 127.Sh STANDARDS 128The 129.Nm 130utility is expected to conform to 131.St -p1003.2-92 . 132.Sh HISTORY 133A 134.Nm 135utility appeared in 136.At v6 . 137