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Example: do I have Apache?
What version do I have?
me@mangle:~$ dpkg --get-selections | grep apache2
apache2 install
apache2-mpm-prefork install
apache2-prefork-dev install
apache2-utils install
apache2.2-bin install
apache2.2-common install
libapache2-mod-perl2 install
libapache2-mod-php5 install
libapache2-mod-python install
libapache2-reload-perl install
libapache2-svn install
rt3.8-apache2 install
me@mangle:~$ dpkg-query --show apache2
apache2 2.2.20-1ubuntu1.1