BSD 4_3_Net_2 release

[unix-history] / usr / src / share / man / man4 / null.4

diff --git a/usr/src/share/man/man4/null.4 b/usr/src/share/man/man4/null.4
index 6558274..89d2f3a 100644 (file)
--- a/usr/src/share/man/man4/null.4
+++ b/usr/src/share/man/man4/null.4
@@ -1,12 +1,56 @@
-.\"    @(#)null.4      6.1 (Berkeley) 5/15/85
-.\"
-.TH NULL 4 "May 15, 1985"
-.AT 3
-.SH NAME
-null \- data sink
-.SH DESCRIPTION
-Data written on a null special file is discarded.
-.PP
-Reads from a null special file always return 0 bytes.
-.SH FILES
-/dev/null
+.\" Copyright (c) 1991 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.
+.\"
+.\"     @(#)null.4     6.2 (Berkeley) 3/28/91
+.\"
+.Dd March 28, 1991
+.Dt NULL 4
+.Os BSD 4.4
+.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 null
+device is always zero.
+.Sh FILES
+.Bl -tag -width /dev/null
+.It Pa /dev/null
+.El
+.Sh HISTORY
+A
+.Nm
+device appeared in
+.At v7 .