79625d00a2
According to POSIX, -a is equal to -bdlprtTu. It seems this is not true in practice, as -b normally restricts the output to BOOT_TIME entries and all implementations that I know of don't.
158 lines
4.2 KiB
Groff
158 lines
4.2 KiB
Groff
.\" 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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.\" 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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.\" $FreeBSD$
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.\"
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.Dd February 11, 2012
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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 on the system
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.Sh SYNOPSIS
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.Nm
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.Op Fl abHmqsTu
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.Op Cm am I
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.Op Ar file
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.Sh DESCRIPTION
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The
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.Nm
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utility displays information about currently logged in users.
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By default, this includes the login name, tty name, date and time of login and
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remote hostname if not local.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a
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Equivalent to
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.Fl bTu ,
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with the exception that output isn't restricted to the time and date of
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the last system reboot.
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.It Fl b
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Write the time and date of the last system reboot.
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.It Fl H
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Write column headings above the output.
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.It Fl m
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Show information about the terminal attached to standard input only.
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.It Fl q
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.Dq "Quick mode" :
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List the names and number of logged in users in columns.
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All other command line options are ignored.
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.It Fl s
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Show the name, line and time fields only.
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This is the default.
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.It Fl T
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Indicate whether each user is accepting messages.
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One of the following characters is written:
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.Pp
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.Bl -tag -width 1n -compact
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.It Li +
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User is accepting messages.
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.It Li \&-
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User is not accepting messages.
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.It Li \&?
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An error occurred.
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.El
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.It Fl u
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Show idle time for each user in hours and minutes as
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.Ar hh Ns : Ns Ar mm ,
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.Ql \&.
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if the user has been idle less that a minute, and
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.Dq Li old
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if the user has been idle more than 24 hours.
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.It Cm am I
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Equivalent to
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.Fl m .
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.El
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.Pp
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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/utx.active .
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An alternate
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.Ar file
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may be specified which is usually
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.Pa /var/log/utx.log
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(or
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.Pa /var/log/utx.log.[0-6]
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depending on site policy as
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.Pa utx.log
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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 utx.log
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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 utx.log
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was last truncated or
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created.
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.Pp
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If
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.Pa /var/log/utx.log
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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
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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 getutxent 3 .
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.Sh ENVIRONMENT
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The
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.Ev COLUMNS , LANG , LC_ALL
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and
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.Ev LC_TIME
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environment variables affect the execution of
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.Nm
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as described in
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.Xr environ 7 .
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.Sh FILES
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.Bl -tag -width /var/log/utx.log.[0-6] -compact
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.It Pa /var/run/utx.active
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.It Pa /var/log/utx.log
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.It Pa /var/log/utx.log.[0-6]
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr last 1 ,
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.Xr users 1 ,
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.Xr w 1 ,
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.Xr getutxent 3
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.Sh STANDARDS
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The
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.Nm
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utility conforms to
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.St -p1003.1-2001 .
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v1 .
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