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.\" $NetBSD: who.1,v 1.24 2018/05/11 16:36:57 sevan Exp $
.\"
.\" Copyright (c) 1986, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)who.1 8.2 (Berkeley) 12/30/93
.\"
.Dd May 11, 2018
.Dt WHO 1
.Os
.Sh NAME
.Nm who
.Nd display who is logged in
.Sh SYNOPSIS
.Nm
.Op Fl abdHlmqrsTtuv
.Op Ar file
.Nm
.Ar am i
.Sh DESCRIPTION
The
.Nm
utility displays a list of all users currently logged on, showing for
each user the login name, tty name, the date and time of login, and
hostname if not local.
.Pp
Available options:
.Bl -tag -width file
.It Fl a
Same as
.Fl -bdlprTtuv .
.It Fl b
Time of last system boot.
.It Fl d
Print dead processes.
.It Fl H
Write column headings above the regular output.
.It Fl l
Print system login processes.
.It Fl m
Only print information about the current terminal.
This is the POSIX way of saying
.Nm
.Ar am i .
.It Fl p
Print active processes spawned by
.Xr init 8 .
.It Fl q
.Dq Quick mode :
List only the names and the number of users currently logged on.
When this option is used, all other options are ignored.
.It Fl r
Print the current runlevel.
Supported runlevels are:
.Bl -tag -width "s (SINGLE_USER)"
.It Dv d Pq Dv DEATH
The system has halted.
.It Dv s Pq Dv SINGLE_USER
The system is running in single user mode.
.It Dv r Pq Dv RUNCOM
The system is executing
.Pa /etc/rc .
.It Dv t Pq Dv READ_TTYS
The system is processing
.Pa /etc/ttys .
.It Dv m Pq Dv MULTI_USER
The system is running in multi-user mode.
.It Dv T Pq Dv CLEAN_TTYS
The system is in the process of stopping processes
associated with terminal devices.
.It Dv c Pq Dv CATATONIA
The system is in the process of shutting down and will
not create new processes.
.El
.It Fl s
List only the name, line and time fields.
This is the default.
.It Fl T
Print a character after the user name indicating the state of the
terminal line:
.Sq +
if the terminal is writable;
.Sq -
if it is not;
and
.Sq \&?
if a bad line is encountered.
.It Fl t
Print last system clock change.
.It Fl u
Print the idle time for each user, and the associated process ID.
.It Fl v
When printing of more information is requested with
.Fl u ,
this switch can be used to also printed
process termination signals,
process exit status,
session id for windowing
and the type of the entry, see documentation of ut_type in
.Xr getutxent 3 .
.It Ar \&am I
Returns the invoker's real user name.
.It Ar file
By default,
.Nm
gathers information from the file
.Pa /var/run/utmpx .
An alternative
.Ar file
may be specified which is usually
.Pa /var/log/wtmpx
(or
.Pa /var/log/wtmp ,
or
.Pa /var/log/wtmpx.[0-6]
or
.Pa /var/log/wtmp.[0-6]
depending on site policy as
.Pa wtmpx
can grow quite large and daily versions may or may not
be kept around after compression by
.Xr ac 8 ) .
The
.Pa wtmpx
and
.Pa wtmp
file contains a record of every login, logout,
crash, shutdown and date change
since
.Pa wtmpx
and
.Pa wtmp
were last truncated or
created.
.El
.Pp
If
.Pa /var/log/wtmpx
or
.Pa /var/log/wtmp
are being used as the file, the user name may be empty
or one of the special characters '|', '}' and '~'.
Logouts produce an output line without any user name.
For more information on the
special characters, see
.Xr utmp 5 .
.Sh FILES
.Bl -tag -width /var/log/wtmp.[0-6] -compact
.It Pa /var/run/utmp
.It Pa /var/run/utmpx
.It Pa /var/log/wtmp
.It Pa /var/log/wtmp.[0-6]
.It Pa /var/log/wtmpx
.It Pa /var/log/wtmpx.[0-6]
.El
.Sh SEE ALSO
.Xr last 1 ,
.Xr mesg 1 ,
.Xr users 1 ,
.Xr getuid 2 ,
.Xr utmp 5 ,
.Xr utmpx 5
.Sh STANDARDS
The
.Nm
utility is expected to conform to
.St -p1003.2-92 .
.Sh HISTORY
A
.Nm
utility appeared in
.At v1 :
.Lk http://cm.bell-labs.com/cm/cs/who/dmr/pdfs/man14.pdf
|
