M4 may refer to:
In the military:
More on [ M4 ]
Procedural :: Compiled
Open Source :: Languages
Procedural :: Languages
Unix :: Operating Systems

GNU m4 - Development site - René Seindal's site for developing the Free Software Foundation's version of the Unix macro processor.
m4 - Powerful (Turing-equivalent) implementation of traditional Unix macro-expansion program, designed as preprocessor to more stubborn languages. Ugly, but fairly standard, available on most platforms.
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