1.\" $NetBSD: who.1,v 1.21 2007/01/17 16:37:41 christos 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. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)who.1 8.2 (Berkeley) 12/30/93 31.\" 32.Dd January 17, 2007 33.Dt WHO 1 34.Os 35.Sh NAME 36.Nm who 37.Nd display who is logged in 38.Sh SYNOPSIS 39.Nm 40.Op Fl abdHlmqrstTuv 41.Op Ar file 42.Nm 43.Ar am i 44.Sh DESCRIPTION 45The 46.Nm 47utility displays a list of all users currently logged on, showing for 48each user the login name, tty name, the date and time of login, and 49hostname if not local. 50.Pp 51Available options: 52.Bl -tag -width file 53.It Fl a 54Same as 55.Fl bdlprTtuv . 56.It Fl b 57Time of last system boot. 58.It Fl d 59Print dead processes. 60.It Fl H 61Write column headings above the regular output. 62.It Fl l 63Print system login processes. 64.It Fl m 65Only print information about the current terminal. 66This is the 67.Tn POSIX 68way of saying 69.Nm 70.Ar am i . 71.It Fl p 72Print active processes spawned by 73.Xr init 8 . 74.It Fl q 75.Dq Quick mode : 76List only the names and the number of users currently logged on. 77When this option is used, all other options are ignored. 78.It Fl r 79Print the current runlevel. 80Supported runlevels are: 81.Bl -tag -width "s (SINGLE_USER)" 82.It Dv d Pq Dv DEATH 83The system has halted. 84.It Dv s Pq Dv SINGLE_USER 85The system is running in single user mode. 86.It Dv r Pq Dv RUNCOM 87The system is executing 88.Pa /etc/rc . 89.It Dv t Pq Dv READ_TTYS 90The system is processing 91.Pa /etc/ttys . 92.It Dv m Pq Dv MULTI_USER 93The system is running in multi-user mode. 94.It Dv T Pq Dv CLEAN_TTYS 95The system is in the process of stopping processes 96associated with terminal devices. 97.It Dv c Pq Dv CATATONIA 98The system is in the process of shutting down and will 99not create new processes. 100.El 101.It Fl s 102List only the name, line and time fields. 103This is the default. 104.It Fl T 105Print a character after the user name indicating the state of the 106terminal line: 107.Sq + 108if the terminal is writable; 109.Sq - 110if it is not; 111and 112.Sq \&? 113if a bad line is encountered. 114.It Fl t 115Print last system clock change. 116.It Fl u 117Print the idle time for each user, and the associated process ID. 118.It Fl v 119When printing of more information is requested with 120.Fl u , 121this switch can be used to also printed 122process termination signals, 123process exit status, 124session id for windowing 125and the type of the entry, see documentation of ut_type in 126.Xr getutxent 3 . 127.It Ar \&am I 128Returns the invoker's real user name. 129.It Ar file 130By default, 131.Nm 132gathers information from the file 133.Pa /var/run/utmpx . 134An alternative 135.Ar file 136may be specified which is usually 137.Pa /var/log/wtmpx 138(or 139.Pa /var/log/wtmp , 140or 141.Pa /var/log/wtmpx.[0-6] 142or 143.Pa /var/log/wtmp.[0-6] 144depending on site policy as 145.Pa wtmpx 146can grow quite large and daily versions may or may not 147be kept around after compression by 148.Xr ac 8 ) . 149The 150.Pa wtmpx 151and 152.Pa wtmp 153file contains a record of every login, logout, 154crash, shutdown and date change 155since 156.Pa wtmpx 157and 158.Pa wtmp 159were last truncated or 160created. 161.El 162.Pp 163If 164.Pa /var/log/wtmpx 165or 166.Pa /var/log/wtmp 167are being used as the file, the user name may be empty 168or one of the special characters '|', '}' and '~'. 169Logouts produce an output line without any user name. 170For more information on the 171special characters, see 172.Xr utmp 5 . 173.Sh FILES 174.Bl -tag -width /var/log/wtmp.[0-6] -compact 175.It Pa /var/run/utmp 176.It Pa /var/run/utmpx 177.It Pa /var/log/wtmp 178.It Pa /var/log/wtmp.[0-6] 179.It Pa /var/log/wtmpx 180.It Pa /var/log/wtmpx.[0-6] 181.El 182.Sh SEE ALSO 183.Xr last 1 , 184.Xr mesg 1 , 185.Xr users 1 , 186.Xr getuid 2 , 187.Xr utmp 5 , 188.Xr utmpx 5 189.Sh STANDARDS 190The 191.Nm 192utility is expected to conform to 193.St -p1003.2-92 . 194.Sh HISTORY 195A 196.Nm 197utility appeared in 198.At v6 . 199