Re: [Groff] .if !dTS - GNU extension?

[Werner LEMBERG]

> 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