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# M4

## Contents

The M4 package contains the M4 processor

## Description

M4 is a macro processor. It copies input to output expanding macros as it goes. Macros are either built-in or user-defined and can take any number of arguments. Besides just doing macro expansion m4 has built-in functions for including named files, running UNIX commands, doing integer arithmetic, manipulating text in various ways, recursion, etc. M4 can be used either as a front-end to a compiler or as a macro processor in its own right.

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