1. 2015-09-15 - Purge configuration from removed packages; Tags: Purge configuration from removed packages
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    Purge configuration from removed packages

    apt-get remove allows to uninstall software packages for Debian and Ubuntu. Some software may still have configuration stored on your system. If you don’t have used apt-get purge, the config files still resides on your Debian installation. This post illustrates how to remove these packages.

    Show all removed debian packages with configuration files:

    dpkg --list | grep ^rc
    

    Example output

    tan@cinhtau:~$ dpkg --list | grep ^rc
    rc  libcouchdb-glib-1.0-2                      0.6.3-0ubuntu2                                  GLib-based API for CouchDB
    rc  libdesktopcouch-glib-1.0-2                 0.6.3-0ubuntu2                                  Glib-based API for Desktopcouch
    rc  libgtkhtml-editor0                         1:3.29.6.is.3.28.3-0ubuntu2                     HTML rendering/editing library - editor widget
    rc  libpst4                                    0.6.41-0ubuntu4                                 Shared library needed by the readpst utilities, and
    

    Use awk to get the package name and use it as input for the purge command.

    sudo dpkg --purge $(dpkg --list | grep ^rc | awk '{ print $2; }')
    

    Another way to achieve the same goal. xargs has the advantage, that it can batch up the arguments to allow one command to process lots of items.

    dpkg --list | grep '^rc\b' | awk '{ print $2 }'\
     | xargs sudo dpkg -P