$ curl cheat.sh/
# a2enmod
# Enable an Apache module on Debian-based OSes.
# More information: <https://manpages.debian.org/latest/apache2/a2enmod.8.en.html>.

# Enable a module:
sudo a2enmod module

# Don't show informative messages:
sudo a2enmod --quiet module

$
Follow @igor_chubin cheat.sh tldr