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+.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
+.\" 
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions are
+.\" met:
+.\" 
+.\" Redistributions of source code and documentation must retain the above
+.\" copyright notice, this list of conditions and the following
+.\" disclaimer.
+.\" 
+.\" 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.
+.\" 
+.\" All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" 
+.\" This product includes software developed or owned by Caldera
+.\" International, Inc.  Neither the name of Caldera International, Inc.
+.\" nor the names of other contributors may be used to endorse or promote
+.\" products derived from this software without specific prior written
+.\" permission.
+.\" 
+.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
+.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. BE LIABLE
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+.\" 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
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+.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\" 
+.\"
+.if n .ls 2
+.if t .tr |\(or
+.NH
+INTRODUCTION
+.PP
+This paper describes how to write
+programs 
+that interface with the
+.UC UNIX
+operating system in a non-trivial way.
+This includes programs that use files by name,
+that use pipes,
+that invoke other commands as they run,
+or that attempt to catch interrupts and other signals
+during execution.
+.PP
+The document collects material which is scattered
+throughout several sections of
+.I
+The
+.UC UNIX
+Programmer's Manual
+.R
+[1]
+for Version 7
+.UC UNIX .
+There is no attempt to be complete;
+only generally useful material is dealt with.
+It is assumed that you will be programming in C,
+so you must be able to read the language
+roughly up to the level of
+.I
+The C Programming Language
+.R
+[2].
+Some of the material in sections 2 through 4
+is based on
+topics covered more carefully there.
+You should also be familiar with
+.UC UNIX
+itself
+at least
+to the level of
+.I
+.UC UNIX
+for Beginners
+.R
+[3].