apachectl -version (return code: 0)
Server version: Apache/2.4.18 (Ubuntu)
Server built: 2016-07-14T12:32:26
apachectl --help (return code: 1)
Usage: /usr/sbin/apachectl start|stop|restart|graceful|graceful-stop|configtest|status|fullstatus|help
/usr/sbin/apachectl <apache2 args>
/usr/sbin/apachectl -h (for help on <apache2 args>)