xref: /freebsd/share/man/man4/null.4 (revision afe61c15161c324a7af299a9b8457aba5afc92db)
1afe61c15SRodney W. Grimes.\" Copyright (c) 1991, 1993
2afe61c15SRodney W. Grimes.\"	The Regents of the University of California.  All rights reserved.
3afe61c15SRodney W. Grimes.\"
4afe61c15SRodney W. Grimes.\" Redistribution and use in source and binary forms, with or without
5afe61c15SRodney W. Grimes.\" modification, are permitted provided that the following conditions
6afe61c15SRodney W. Grimes.\" are met:
7afe61c15SRodney W. Grimes.\" 1. Redistributions of source code must retain the above copyright
8afe61c15SRodney W. Grimes.\"    notice, this list of conditions and the following disclaimer.
9afe61c15SRodney W. Grimes.\" 2. Redistributions in binary form must reproduce the above copyright
10afe61c15SRodney W. Grimes.\"    notice, this list of conditions and the following disclaimer in the
11afe61c15SRodney W. Grimes.\"    documentation and/or other materials provided with the distribution.
12afe61c15SRodney W. Grimes.\" 3. All advertising materials mentioning features or use of this software
13afe61c15SRodney W. Grimes.\"    must display the following acknowledgement:
14afe61c15SRodney W. Grimes.\"	This product includes software developed by the University of
15afe61c15SRodney W. Grimes.\"	California, Berkeley and its contributors.
16afe61c15SRodney W. Grimes.\" 4. Neither the name of the University nor the names of its contributors
17afe61c15SRodney W. Grimes.\"    may be used to endorse or promote products derived from this software
18afe61c15SRodney W. Grimes.\"    without specific prior written permission.
19afe61c15SRodney W. Grimes.\"
20afe61c15SRodney W. Grimes.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21afe61c15SRodney W. Grimes.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22afe61c15SRodney W. Grimes.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23afe61c15SRodney W. Grimes.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24afe61c15SRodney W. Grimes.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25afe61c15SRodney W. Grimes.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26afe61c15SRodney W. Grimes.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27afe61c15SRodney W. Grimes.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28afe61c15SRodney W. Grimes.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29afe61c15SRodney W. Grimes.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30afe61c15SRodney W. Grimes.\" SUCH DAMAGE.
31afe61c15SRodney W. Grimes.\"
32afe61c15SRodney W. Grimes.\"	@(#)null.4	8.1 (Berkeley) 6/5/93
33afe61c15SRodney W. Grimes.\"
34afe61c15SRodney W. Grimes.Dd June 5, 1993
35afe61c15SRodney W. Grimes.Dt NULL 4
36afe61c15SRodney W. Grimes.Os
37afe61c15SRodney W. Grimes.Sh NAME
38afe61c15SRodney W. Grimes.Nm null
39afe61c15SRodney W. Grimes.Nd the null device
40afe61c15SRodney W. Grimes.Sh DESCRIPTION
41afe61c15SRodney W. GrimesThe
42afe61c15SRodney W. Grimes.Nm
43afe61c15SRodney W. Grimesdevice accepts and reads data as any ordinary (and willing)
44afe61c15SRodney W. Grimesfile \-
45afe61c15SRodney W. Grimesbut throws it away. The length of the
46afe61c15SRodney W. Grimes.Nm null
47afe61c15SRodney W. Grimesdevice is always zero.
48afe61c15SRodney W. Grimes.Sh FILES
49afe61c15SRodney W. Grimes.Bl -tag -width /dev/null
50afe61c15SRodney W. Grimes.It Pa /dev/null
51afe61c15SRodney W. Grimes.El
52afe61c15SRodney W. Grimes.Sh HISTORY
53afe61c15SRodney W. GrimesA
54afe61c15SRodney W. Grimes.Nm
55afe61c15SRodney W. Grimesdevice appeared in
56afe61c15SRodney W. Grimes.At v7 .
57