zcat /usr/share/man/man1/ls.1.gz | groff -Tascii -man | less -R
This unzips and cats a compressed man page through
groff to format it, and then to
less so that you can scroll. The
-R, which you may or may not need, prevents certain ANSI escape sequences from showing as “ESC [ …” garble (the same situation with
git is described here).