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+.\"	$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 .