[bug #57510] not all TTY output controls simultaneously available (nroff needs -P)

[Ingo Schwarze]

Follow-up Comment #11, bug #57510 (project groff):

A dry-run flag for nroff sounds like a reasonable plan to me.

Consulting https://mandoc.bsd.lv/man/man.options.1.html ,  i notice the -n
that is often used for dry-run functionality is already taken for troff (since
Version 7 AT&T UNIX) and hence also in groff and GNU nroff.

I think i'd suggest using -V because that is already used for a very similar
purpose in groff (since groff-0.6 (Sep 2, 1990)), does not appear to clash
with anything else, and being an upper-case option, gives it relatively little
prominence, which is good for this option.

After printing the constructed groff command, you might even consider
appending -V and then running *that*, too, such that the groff pipeline is
also printed.  Or maybe not.  Not sure - just suggesting to think about it. 
Does it add significant value?  If not, keep it minimal.

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