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What's the best introduction out there for someone who's never touched M4 before?

Michael Breen has a nice introduction to m4.

The GNU manual is pretty good. You can run `info m4` or read it from the links here:

https://www.gnu.org/software/m4/manual/index.html

The default info pager is pretty horrible. I would recommend installing pinfo (usually available in official repos) which is an info pager with user interace similiar to lynx.

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