m4: add page (#2488)

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Arun Isaac 2018-10-31 05:52:33 +05:30 committed by Starbeamrainbowlabs
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# m4
> Macro processor.
- Process macros in a file:
`m4 {{path/to/file}}`
- Define a macro before processing files:
`m4 -D{{macro_name}}={{macro_value}} {{path/to/file}}`