Oh, erm, whoops. Well in my defence, searching for "d" didn't get me terribly far, haha. Thanks!
Out of curiosity, would there be any way in classical troff to detect if a macro is defined? Short of diverting the output of .pm I mean... On 28 April 2016 at 03:10, Werner LEMBERG <w...@gnu.org> wrote: > > > This left me wondering if it's a Groff extension, but I couldn't find any > > mention of it in *groff_diff*. Or is there something else I'm missing? > > Have a look at the `Miscellaneous' section in the `groff_diff' man > page! The `!' is a NOT operator (which isn't new), and the GNU troff > extension `d' is documented there. > > The canonical documentation, BTW, are the groff info files, cf. > > http://www.gnu.org/software/groff/manual/ > > > Werner >
