$ curl cheat.sh/
# a2enconf
# Enable an Apache configuration file on Debian-based OSes.
# More information: <https://manpages.debian.org/latest/apache2/a2enconf.8.en.html>.

# Enable a configuration file:
sudo a2enconf configuration_file

# Don't show informative messages:
sudo a2enconf --quiet configuration_file

$
Follow @igor_chubin cheat.sh tldr