[BUG] significantly changes the text to be printed. [v13.7.0] about rich HOT 4 OPEN

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from rich.

This issue is not found on Linux (Debian unstable), with both rich 13.3.1 and 13.7.0. Maybe apple has done some good job here.

from rich.

The bold and underlined formatting you see in man pages is produced using backspace (BS) control characters. This harks back to the days of the typewriter, where to make text bold you would print a character, backspace, and then print it again. For underlined text you would print an underscore, backspace, and then print the character.

It looks like this backspace is not being interpreted in the print output, so the bold text has these duplicated characters and underlined text includes the underscores. I'm not familiar enough yet with Rich to explain why you're seeing this only on macOS but not Linux though...

You probably want to strip these BS control characters from your document:

man man | col -b > out.txt

from rich.

On MacOS 14.0 copying and pasting the text to a document named man.1 did not reproduced the error but creating the document using man man > man.1 did.

Using vim, we can see that the document created by man man > man.1 has some unique characters added (not sure what it means but seems to be related to what @TomJGooding mentioned)

from rich.