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- the BSD-formatted man page is now who.1 and the GNO-formatted man
page is who.1G
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usr.bin/who/who.1G
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usr.bin/who/who.1G
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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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.\" $Id: who.1G,v 1.1 1998/01/26 06:18:13 taubert Exp $
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.\"
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.TH WHO 1 "26 October 1997" GNO "Commands and Applications"
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.SH NAME
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.BR who
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\- display who is logged in
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.SH SYNOPSIS
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.BR who
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.RB [ am
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.BR I ]
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.RI [ file ]
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.SH DESCRIPTION
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The utility
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.BR who
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displays
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a list of all users currently logged on, showing for each user
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the login name,
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tty name, the date and time of login, and hostname if not local.
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.LP
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Available options:
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.RS
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.IP "\fBam I\fR"
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Returns the invoker's real user name.
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.IP \fIfile\fR
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By default,
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.BR who
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gathers information from the file
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.BR /var/run/utmp .
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An alternate
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.BR file
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may be specified which is usually
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.BR /var/run/wtmp
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(or
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.BR /var/run/wtmp.[0-6]
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depending on site policy as
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.BR 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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.BR ac (8)).
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The
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.BR 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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.BR wtmp
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was last truncated or
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created.
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.RE
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.LP
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If
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.BR /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 '~'. Logouts produce
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an output line without any user name. For more information on the
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special characters, see
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.BR utmp (5).
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.SH FILES
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.B /var/run/utmp
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.br
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.B /var/log/wtmp
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.br
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.B /var/log/wtmp.[0-6]
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.SH SEE ALSO
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.BR last (1),
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.BR users (1),
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.BR getuid (2),
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.BR utmp (5)
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.SH HISTORY
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A
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.BR who
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command appeared in Version 6 AT&T UNIX.
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