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<sect2><title>Short description</title>
<para><command>m4</command> copies the given files
while expanding the macros that they contain. These 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, and so on. The m4 program can be used either as a front-end to a
compiler or as a macro processor in its own right.</para>
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