.\" Copyright (c) 1986, 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. 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.
.\"
.\"	@(#)Title	8.2 (Berkeley) 4/19/94
.\"
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UNIX Programmer's Supplementary Documents
(PSD)
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4.4 Berkeley Software Distribution
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.pt 12
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.ce
June, 1993
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Computer Systems Research Group
Computer Science Division
Department of Electrical Engineering and Computer Science
University of California
Berkeley, California  94720
.bp
\&
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.hy 0
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Copyright 1979, 1980, 1983, 1986, 1993
The Regents of the University of California.  All rights reserved.
.sp 2
Other than the specific documents listed below as copyrighted by AT&T,
redistribution and use of this manual in source and binary forms,
with or without modification, are permitted provided that the
following conditions are met:
.sp 0.5
.in +0.2i
.ta 0.2i
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1)	Redistributions of this manual must retain the copyright
notices on this page, this list of conditions and the following disclaimer.
.ti -0.2i
2)	Software or documentation that incorporates part of this manual must
reproduce the copyright notices on this page, this list of conditions and
the following disclaimer in the documentation and/or other materials
provided with the distribution.
.ti -0.2i
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.''
.ti -0.2i
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.
.in -0.2i
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\fB\s-1THIS 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.\s+1\fP
.sp 2
Documents PSD:1, 2, 3, 4, 6, 11, 15, 16, and 17
are copyright 1979, AT&T Bell Laboratories, Incorporated.
Document PSD:8 is a modification of an earlier document that
is copyrighted 1979 by AT&T Bell Laboratories, Incorporated.
Holders of \x'-1p'UNIX\v'-4p'\s-3TM\s0\v'4p'/32V,
System III, or System V software licenses are
permitted to copy these documents, or any portion of them,
as necessary for licensed use of the software,
provided this copyright notice and statement of permission
are included.
.sp 2
Document PSD:10 is part of the user contributed software and is
copyright 1992 by the Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of
this document provided the copyright notice and this permission notice
are preserved on all copies.
.sp 2
Document PSD:13 is part of the user contributed software and is
copyright 1983 by Walter F. Tichy.
Permission to copy the RCS documentation or any portion thereof as
necessary for licensed use of the software is granted to licensees
of this software, provided this copyright notice is included.
.sp 2
The views and conclusions contained in this manual are those of the
authors and should not be interpreted as representing official policies,
either expressed or implied, of the Regents of the University of California.
