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Document what remains of the 2BSD heritage.
All facts found on the CSRG CD 1 in the 2bsd directory.
Feedback and ok jmc@, ok sobrado@.

Note the large number of 3BSD -> 2BSD changes.
Kirk McKusick asked Cynthia Livingston (cael@, of USENIX, who converted
most manuals from man(7) to mdoc(7) for the 4.3BSD-Net/2 release and
added lots of historical information around that time) what happened
in this respect, and she answered that she often wrote "appeared
in 3BSD" when she was unsure of when a utility was added.
Thanks to Kirk and Cynthia for that clarification.

.\"	$OpenBSD: from.1,v 1.11 2012/01/15 20:06:40 schwarze Exp $
.\"	$NetBSD: from.1,v 1.4 1995/09/01 01:39:09 jtc Exp $
.\"
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.\"	@(#)from.1	8.2 (Berkeley) 12/30/93
.\"
.Dd $Mdocdate: January 15 2012 $
.Dt FROM 1
.Os
.Sh NAME
.Nm from
.Nd print names of those who have sent mail
.Sh SYNOPSIS
.Nm from
.Op Fl f Ar file
.Op Fl s Ar sender
.Op Ar user
.Sh DESCRIPTION
.Nm
prints
out the mail header lines from the invoker's mailbox.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl f Ar file
The supplied file
is examined instead of the invoker's mailbox.
If the
.Fl f
option is used, the
.Ar user
argument should not be used.
.It Fl s Ar sender
Only mail from addresses containing
the
supplied string are printed.
.El
.Pp
If
.Ar user
is given, the
.Ar user Ns 's
mailbox, is examined instead of the invoker's own mailbox.
(Privileges are required.)
.Sh FILES
.Bl -tag -width /var/mail/* -compact
.It Pa /var/mail/*
.El
.Sh SEE ALSO
.Xr biff 1 ,
.Xr mail 1
.Sh HISTORY
The
.Nm
command appeared in
.Bx 2 .
.Sh AUTHORS
.An Bill Joy ,
1979.