This book is intended to serve the following three groups of people:
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UNIX systems programmers who are familiar with some version of UNIX other than SVR4, particularly SunOS 4.x or BSD, and who are now faced with the daunting task of porting every program they ever wrote to the new system.
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People who aren't systems programmers and don't want to be, but nevertheless must port some piece of software from some other version of UNIX to SVR4.
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C programmers who wish to move into the area of UNIX systems programming, either for fun or profit.