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4.1.6 Preprocessors in man pages

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).