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- <sect2><title>Contents of M4</title>
- <para>(Last checked against version &m4-contversion;.)</para>
- <para>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. The m4 program can be used either as a front-end to a
- compiler or as a macro processor in its own right.</para>
- <para><emphasis>Installed program</emphasis>: m4</para>
- </sect2>
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