Ubuntu/apache2

apache2 is the most popular web hosting application on the market today

start|stop|restart apache2

sudo /etc/init.d/apache2 start|stop|restart

OR

sudo service apache2 start|stop|restart

apache2 enable site

a2ensite [site config file name]
i.e. a2ensite default-ssl

apache2 disable site

a2dissite [site config file name]
i.e. a2dissite default-ssl

apache2 enable module

a2enmod [module]
i.e. a2enmod mod_ssl

apache2 disable module

a2dismod [module]
i.e. a2dismod mod_ssl