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Revision 1.5, Sat Aug 31 16:26:24 2019 UTC (4 years, 9 months ago) by schwarze
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, OPENBSD_7_0_BASE, OPENBSD_7_0, OPENBSD_6_9_BASE, OPENBSD_6_9, OPENBSD_6_8_BASE, OPENBSD_6_8, OPENBSD_6_7_BASE, OPENBSD_6_7, OPENBSD_6_6_BASE, OPENBSD_6_6, HEAD
Changes since 1.4: +9 -5 lines 

correct HISTORY of /dev/null

facts researched from:
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V4/man/man1/sh.1
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V4/nsys/ken/mem.c
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V5/usr/sys/dmr/mem.c
https://minnie.tuhs.org/cgi-bin/utree.pl?file=V6/usr/man/man4/mem.4

error reported by Sevan Janiyan <venture37 at geeklan dot co dot uk>
wording proposed by jmc@
OK jmc@ sobrado@

.\"	$OpenBSD: null.4,v 1.5 2019/08/31 16:26:24 schwarze Exp $
.\"	$NetBSD: null.4,v 1.3 1994/11/30 16:22:29 jtc Exp $
.\"
.\" Copyright (c) 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. 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.
.\"
.\"	@(#)null.4	8.1 (Berkeley) 6/5/93
.\"
.Dd $Mdocdate: August 31 2019 $
.Dt NULL 4
.Os
.Sh NAME
.Nm null
.Nd the null device
.Sh DESCRIPTION
The
.Nm
device accepts and reads data as any ordinary (and willing) file,
but throws it away.
The length of the
.Nm
device is always zero.
.Sh FILES
.Bl -tag -width /dev/null
.It Pa /dev/null
.El
.Sh SEE ALSO
.Xr zero 4
.Sh HISTORY
.Nm
first appeared in
.At v4
as an empty file,
.Pa /dev/null ,
which returned end of file when being read from.
An implementation which could also be written to first appeared in
.At v5 .