137 lines
3.7 KiB
Groff
137 lines
3.7 KiB
Groff
.\" $NetBSD: who.1,v 1.12 2003/02/25 10:36:01 wiz Exp $
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.\"
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.\" Copyright (c) 1986, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)who.1 8.2 (Berkeley) 12/30/93
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.\"
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.Dd December 6, 1994
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.Dt WHO 1
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.Os
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.Sh NAME
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.Nm who
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.Nd display who is logged in
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.Sh SYNOPSIS
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.Nm
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.Op Fl mTuH
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.Op Ar file
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.Nm
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.Ar am i
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.Sh DESCRIPTION
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The
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.Nm
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utility displays a list of all users currently logged on, showing for
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each user the login name, tty name, the date and time of login, and
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hostname if not local.
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.Pp
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Available options:
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.Pp
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.Bl -tag -width file
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.It Fl m
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Only print information about the current terminal.
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This is the
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.Tn POSIX
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way of saying
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.Nm
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.Ar am i .
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.It Fl T
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Print a character after the user name indicating the state of the
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terminal line:
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.Sq +
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if the terminal is writable;
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.Sq -
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if it is not;
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and
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.Sq ?
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if a bad line is encountered.
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.It Fl u
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Print the idle time for each user.
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.It Fl H
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Write column headings above the regular output.
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.It Ar \&am I
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Returns the invoker's real user name.
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.It Ar file
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By default,
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.Nm
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gathers information from the file
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.Pa /var/run/utmp .
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An alternative
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.Ar file
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may be specified which is usually
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.Pa /var/log/wtmp
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(or
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.Pa /var/log/wtmp.[0-6]
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depending on site policy as
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.Pa wtmp
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can grow quite large and daily versions may or may not
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be kept around after compression by
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.Xr ac 8 ) .
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The
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.Pa wtmp
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file contains a record of every login, logout,
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crash, shutdown and date change
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since
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.Pa wtmp
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was last truncated or
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created.
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.El
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.Pp
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If
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.Pa /var/log/wtmp
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is being used as the file, the user name may be empty
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or one of the special characters '|', '}' and '~'.
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Logouts produce an output line without any user name.
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For more information on the
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special characters, see
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.Xr utmp 5 .
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.Sh FILES
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.Bl -tag -width /var/log/wtmp.[0-6] -compact
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.It Pa /var/run/utmp
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.It Pa /var/log/wtmp
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.It Pa /var/log/wtmp.[0-6]
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.El
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.Sh SEE ALSO
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.Xr last 1 ,
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.Xr mesg 1 ,
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.Xr users 1 ,
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.Xr getuid 2 ,
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.Xr utmp 5
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.Sh STANDARDS
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The
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.Nm
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utility is expected to conform to
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.St -p1003.2-92 .
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.Sh HISTORY
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A
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.Nm
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utility appeared in
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.At v6 .
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