New answers tagged roff
The "first form" is a... feature of groff. If your "nroff" is not a wrapper for groff, you will see only the second form. The feature is referred to in the manual page for grotty (groff driver for typewriter-like devices): By default, grotty emits SGR escape sequences (from ISO 6429, also called ANSI color escapes) to change text attributes ...
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