Use
All UNIXes make the m4 macro processor available, and POSIX has standardized it. Most users require m4 simply as a dependency of GNU autoconf, although the language is used in other contexts.
A macro processor (or a preprocessor) operates as a text-replacement tool. End-users often employ it to re-use text templates, typically in programming applications, but also in text editing and in text-processing applications.
Read more about this topic: M4 (computer Language)
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