freebsd-skq/usr.bin/who/who.1

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.\" Copyright (c) 1986, 1991, 1993
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.\" @(#)who.1 8.2 (Berkeley) 12/30/93
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.\" $FreeBSD$
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.\"
.Dd February 11, 2012
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.Dt WHO 1
.Os
.Sh NAME
.Nm who
.Nd display who is on the system
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.Sh SYNOPSIS
.Nm
.Op Fl abHmqsTu
.Op Cm am I
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.Op Ar file
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.Sh DESCRIPTION
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The
.Nm
utility displays information about currently logged in users.
By default, this includes the login name, tty name, date and time of login and
remote hostname if not local.
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.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl a
Equivalent to
.Fl bTu ,
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with the exception that output is not restricted to the time and date of
the last system reboot.
.It Fl b
Write the time and date of the last system reboot.
.It Fl H
Write column headings above the output.
.It Fl m
Show information about the terminal attached to standard input only.
.It Fl q
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.Dq "Quick mode" :
List the names and number of logged in users in columns.
All other command line options are ignored.
.It Fl s
Show the name, line and time fields only.
This is the default.
.It Fl T
Indicate whether each user is accepting messages.
One of the following characters is written:
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.Pp
.Bl -tag -width 1n -compact
.It Li +
User is accepting messages.
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.It Li \&-
User is not accepting messages.
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.It Li \&?
An error occurred.
.El
.It Fl u
Show idle time for each user in hours and minutes as
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.Ar hh Ns : Ns Ar mm ,
.Ql \&.
if the user has been idle less than a minute, and
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.Dq Li old
if the user has been idle more than 24 hours.
.It Cm am I
Equivalent to
.Fl m .
.El
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.Pp
By default,
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.Nm
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gathers information from the file
.Pa /var/run/utx.active .
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An alternate
.Ar file
may be specified which is usually
.Pa /var/log/utx.log
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(or
.Pa /var/log/utx.log.[0-6]
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depending on site policy as
.Pa utx.log
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can grow quite large and daily versions may or may not
be kept around after compression by
.Xr ac 8 ) .
The
.Pa utx.log
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file contains a record of every login, logout,
crash, shutdown and date change
since
.Pa utx.log
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was last truncated or
created.
.Pp
If
.Pa /var/log/utx.log
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is 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
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special characters, see
.Xr getutxent 3 .
.Sh ENVIRONMENT
The
.Ev COLUMNS , LANG , LC_ALL
and
.Ev LC_TIME
environment variables affect the execution of
.Nm
as described in
.Xr environ 7 .
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.Sh FILES
.Bl -tag -width /var/log/utx.log.[0-6] -compact
.It Pa /var/run/utx.active
.It Pa /var/log/utx.log
.It Pa /var/log/utx.log.[0-6]
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.El
.Sh EXIT STATUS
.Ex -std
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.Sh SEE ALSO
.Xr last 1 ,
.Xr users 1 ,
.Xr w 1 ,
.Xr getutxent 3
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.1-2001 .
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.Sh HISTORY
A
.Nm
command appeared in
.At v1 .