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+.\" This module is believed to contain source code proprietary to AT&T.
+.\" Use and redistribution is subject to the Berkeley Software License
+.\" Agreement and your Software Agreement with AT&T (Western Electric).
+.\"
+.\"	@(#)p1	8.1 (Berkeley) 6/8/93
+.\"
+.\" $FreeBSD$
+.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].