Re: [Groff] `centre' keyword, `u' and `z' specifiers in tbl, \= in items

[Werner LEMBERG]

> > Can someone please check whether the English spelling `centre'
> > works as an alternative to the `center' keyword in UNIX tbl also?
> > GNU tbl supports both.
> 
> No.
> 
>       6 } options [] = {
>       7         "expand", &expflg,
>       8         "EXPAND", &expflg,
>       9         "center", &ctrflg,
>      10         "CENTER", &ctrflg,
> [...]

Thanks.  It shows another interesting feature: All keywords exist both
in lowercase and uppercase versions!  Is this true with non-plan9
versions of troff also?  Shall I take care of this (undocumented)
feature?

> > Finally, GNU tbl supports not only `\_' (to have a short horizontal
> > line) but also `\=' to get a short double horizontal line.  Is this
> > feature also available with UNIX tbl?
> 
>     $ cat in    # output is as I'd expect.
>     .TS
>     tab(:);
>     c c c
>     c c s.
>     aaa:bbb:ccc
>     aaa:\_
>     aaa:\=
>     aaa:bbb
>     .TE

Thanks again!  So only `centre' is a GNU extension, the rest is just
undocumented.


    Werner