The command we need to use to list the packages currently installed in Ubuntu or Debian is dpkg –get-selections. For example:
# dpkg --get-selections acpi install acpi-support-base install acpid install adduser install apache2 install apache2-mpm-prefork install apache2-utils install apache2.2-common install apt install apt-utils install aptitude install autoconf install automake install automake1.4 install autotools-dev install avahi-daemon install bacula-common install bacula-fd install base-files install base-passwd install bash install bind9-host install binutils install …
It will return a long list showing all the installed packages. To filter to specific list of packages, for example we only need to show java packages, combine it with grep, for example:
# dpkg --get-selections|grep java java-common install java-gcj-compat install java-gcj-compat-headless install libbcel-java install liblog4j1.2-java install liblog4j1.2-java-gcj install libmx4j-java install libpg-java install libregexp-java install sun-java6-bin install sun-java6-jdk install sun-java6-jre install
We can find the locations of the files within a package from the list by using the dpkg -L command, such as:
# dpkg -L sun-java6-jdk|more /. /usr /usr/share /usr/share/doc /usr/share/doc/sun-java6-jdk /usr/share/doc/sun-java6-jdk/changelog.Debian.gz /usr/share/doc/sun-java6-jdk/copyright /usr/share/doc/sun-java6-jdk/README.alternatives /usr/share/doc/sun-java6-jdk/README.html /usr/share/menu /usr/share/menu/sun-java6-jdk /usr/share/applications /usr/share/applications/sun-java6-jconsole.desktop /usr/share/lintian /usr/share/lintian/overrides /usr/share/lintian/overrides/sun-java6-jdk /usr/share/doc-base /usr/share/doc-base/sun-java6-jdk-readme /usr/lib /usr/lib/jvm /usr/lib/jvm/java-6-sun-1.6.0.12 /usr/lib/jvm/java-6-sun-1.6.0.12/include /usr/lib/jvm/java-6-sun-1.6.0.12/include/linux /usr/lib/jvm/java-6-sun-1.6.0.12/include/linux/jni_md.h /usr/lib/jvm/java-6-sun-1.6.0.12/include/linux/jawt_md.h /usr/lib/jvm/java-6-sun-1.6.0.12/include/jni.h /usr/lib/jvm/java-6-sun-1.6.0.12/include/jdwpTransport.h …
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