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(groff)Preprocessors in man pages

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Preprocessors in `man' pages
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   If a preprocessor like `gtbl' or `geqn' is needed, it has become
common usage to make the first line of the man page look like this:


     .\" WORD

Note the single space character after the double quote.  WORD consists
of letters for the needed preprocessors: `e' for `geqn', `r' for
`grefer', `t' for `gtbl'.  Modern implementations of the `man' program
read this first line and automatically call the right preprocessor(s).