Follow-up Comment #5, bug #68668 (group groff): It occurs to me that one could write a postprocessor to censor or rewrite undesired device extension commands.
I'll illustrate how simple that can be.
First, let's see what GNU _troff_ loads up the _neqn_(1) man page with when
formatting for a terminal.
$ nroff -man -Z ./build/src/preproc/eqn/neqn.1 | grep 'x X'
x X devtag:.NH 1
x X devtag:.eo.h
x X devtag:.NH 1
x X devtag:.eo.h
x X devtag:.NH 1
x X devtag:.eo.h
x X tty: link man:eqn(1)
x X tty: link
x X devtag:.NH 1
x X devtag:.eo.h
x X devtag:.NH 1
x X devtag:.eo.h
x X tty: link man:eqn(1)
x X tty: link
Now let's get a dump of the rendered contents...
$ nroff -man -Z ./build/src/preproc/eqn/neqn.1 | grotty -i | cat -v >|
UNSTRIPPED
Apply our highly complex postprocessor...
$ nroff -man -Z ./build/src/preproc/eqn/neqn.1 | grep -v '^x X' | grotty -i |
cat -v >| STRIPPED
...and observe the difference.
$ diff -U0 UNSTRIPPED STRIPPED
--- UNSTRIPPED 2026-10-13 17:31:36.254888488 -0500
+++ STRIPPED 2026-10-13 17:31:42.430876492 -0500
@@ -10 +10 @@
- ^[[3mneqn^[[23m invokes the
^[]8;;man:eqn(1)^[\^[[3meqn^[[23m(1)^[]8;;^[\ command with the ^[[1mascii
^[[22moutput device.
+ ^[[3mneqn^[[23m invokes the ^[[3meqn^[[23m(1) command with the
^[[1mascii ^[[22moutput device.
@@ -26 +26 @@
- ^[]8;;man:eqn(1)^[\^[[3meqn^[[23m(1)^[]8;;^[\
+ ^[[3meqn^[[23m(1)
Danger averted!
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