Get a plain text of man page without backspaces and underscores on MacOS and BSD

To get a plain text version of a man page, without backspaces and underscores, try

man foo | col -b > foo.mantxt
man foo | col -bx > foo.mantxt

explaination

-b      Do not output any backspaces, printing only the last character written to each column position.
-x      Output multiple spaces instead of tabs.

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