dpkg -l | grep apache
ii  apache-common                     1.3.34-4.1                      support files for all Apache webservers
ii  apache-dev                        1.3.34-4.1                      development kit for the Apache webserver
ii  apache2-mpm-worker                2.2.3-4                         High speed threaded model for Apache HTTPD 2
ii  apache2-utils                     2.2.3-4                         utility programs for webservers
ii  apache2.2-common                  2.2.3-4                         Next generation, scalable, extendable web se
ii  libapache2-mod-proxy-html         2.5.2-1.1                       Apache2 filter module for HTML links rewriti