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+.\" 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. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. 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 December 30, 1993
+.Dt WHO 1
+.Os
+.Sh NAME
+.Nm who
+.Nd display who is logged in
+.Sh SYNOPSIS
+.Nm who
+.Op Ar am I
+.Op Ar file 
+.Sh DESCRIPTION
+The utility
+.Nm who
+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:
+.Pp
+.Bl -tag -width file
+.It Ar \&am I
+Returns the invoker's real user name. 
+.It Ar file
+By default,
+.Nm who
+gathers information from the file
+.Pa /var/run/utmp .
+An alternate
+.Ar file
+may be specified which is usually
+.Pa /var/run/wtmp
+(or
+.Pa /var/run/wtmp.[0-6]
+depending on site policy as
+.Pa wtmp
+can grow quite large and daily versions may or may not
+be kept around after compression by
+.Xr ac 8 ) .
+The
+.Pa wtmp
+file contains a record of every login, logout,
+crash, shutdown and date change
+since
+.Pa wtmp
+was last truncated or
+created.
+.El
+.Pp
+If
+.Pa /var/log/wtmp
+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
+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/log/wtmp
+.It Pa /var/log/wtmp.[0-6]
+.El
+.Sh SEE ALSO
+.Xr last 1 ,
+.Xr users 1 ,
+.Xr getuid 2 ,
+.Xr utmp 5
+.Sh HISTORY
+A
+.Nm
+command appeared in
+.At v6 .