Version of Apache installed on a Debian machine
Try apachectl -V: $ apachectl -V Server version: Apache/2.2.9 (Unix) Server built: Sep 18 2008 21:54:05 Server’s Module Magic Number: 20051115:15 Server loaded: APR 1.2.7, APR-Util 1.2.7 Compiled using: APR 1.2.7, APR-Util 1.2.7 … etc … If it does not work for you, run the command with sudo.