| 123456789101112131415 | <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, expandingmacros as it goes. Macros are either built-in or user-defined and cantake any number of arguments. Besides just doing macro expansion, m4has built-in functions for including named files, running Unixcommands, doing integer arithmetic, manipulating text in various ways,recursion, etc. The m4 program can be used either as a front-end to acompiler or as a macro processor in its own right.</para><para><emphasis>Installed program</emphasis>: m4</para></sect2>
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