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Since the installation, I have added not too few PPAs to my 15.04 system because I wanted a specific application. But sometimes I have removed that package later again, because it did not work, was not what I really wanted, or just because I don't need it any more. I don't know if that makes a difference, but some repositories were installed with add-apt-repository while others just came by a command that just created the file in /etc/apt/sources.list.d/ manually.

Now how can I check whether I have any packages from a PPA installed and if not, remove it from my software sources? This procedure should automatically work through all PPAs.

Here is a script. Without a parameter, the script lists some infos. With --delete, the list files will be removed, if no packages are installed.

#!/usr/bin/env bash

for f in /etc/apt/sources.list.d/*.list; do

    grep -Po "(?<=^debs).*?(?=#|$)" "$f" | while read -r ENTRY ; do

    echo "ENTRY: $ENTRY"

        HOST=$(cut -d/ -f3 <<< "$ENTRY")



        if [ "ppa.launchpad.net" = "$HOST" ]; then

          USER=$(cut -d/ -f4 <<< "$ENTRY")

          PPA=$(cut -d/ -f5 <<< "$ENTRY")

          packageCount=$(awk '$1=="Package:" {if (a[$2]++ == 0) {system("dpkg -l "$2)}}' /var/lib/apt/lists/*"$USER"*"$PPA"*Packages 2>/dev/null | awk '/^ii/' | wc -l)

          echo "PPA: ppa:$USER/$PPA"

          echo "FILENAME: $f"

          echo "$packageCount package(s) installed"

          if [ "$packageCount" -eq 0 ] && [ "$1" == "--delete" ]; then

            sudo rm "$f" && echo "$f deleted"

          fi

          echo

        else 

          USER=$(cut -d/ -f3 <<< "$ENTRY")

          PPA=$(cut -d/ -f4 <<< "$ENTRY")

          packageCount=$(awk '$1=="Package:" {if (a[$2]++ == 0) {system("dpkg -l "$2)}}' /var/lib/apt/lists/*"$USER"*Packages 2>/dev/null | awk '/^ii/' | wc -l)

          echo "REPOSITORY: $USER/$PPA"

          echo "FILENAME: $f"

          echo "$packageCount package(s) installed"

          if [ "$packageCount" -eq 0 ] && [ "$1" == "--delete" ]; then

            sudo rm "$f" && echo "$f deleted" 

          fi

          echo

        fi

    done

done

Copy the code above in a new file, e.g.:

mkdir -p ~/bin

nano ~/bin/checkPPAs

Make the script executable

chmod +x ~/bin/checkPPAs

And run it with

~/bin/checkPPAs

to list all repositories and the number of installed packages.

Start the script with

~/bin/checkPPAs --delete

to remove the list files.

Sample output on my system

ENTRY: http://ppa.launchpad.net/webupd8team/y-ppa-manager/ubuntu vivid main

PPA: ppa:webupd8team/y-ppa-manager

FILENAME: /etc/apt/sources.list.d/webupd8team-ubuntu-y-ppa-manager-vivid.list

3 package(s) installed



ENTRY: http://ppa.launchpad.net/nilarimogard/webupd8/ubuntu vivid main

PPA: ppa:nilarimogard/webupd8

FILENAME: /etc/apt/sources.list.d/nilarimogard-ubuntu-webupd8-vivid.list

5 package(s) installed



ENTRY: http://ppa.launchpad.net/obsproject/obs-studio/ubuntu vivid main

PPA: ppa:obsproject/obs-studio

FILENAME: /etc/apt/sources.list.d/obsproject-ubuntu-obs-studio-vivid.list

1 package(s) installed



ENTRY: http://archive.getdeb.net/ubuntu vivid-getdeb apps

REPOSITORY: archive.getdeb.net/ubuntu vivid-getdeb apps

FILENAME: /etc/apt/sources.list.d/getdeb.list

7 package(s) installed



ENTRY: http://ppa.launchpad.net/psi-plus/ppa/ubuntu vivid main

PPA: ppa:psi-plus/ppa

FILENAME: /etc/apt/sources.list.d/psi-plus-ubuntu-ppa-vivid.list

15 package(s) installed



ENTRY: http://ppa.launchpad.net/libreoffice/ppa/ubuntu vivid main

PPA: ppa:libreoffice/ppa

FILENAME: /etc/apt/sources.list.d/libreoffice-ubuntu-ppa-vivid.list

24 package(s) installed



ENTRY: https://deb.nodesource.com/node_0.12 vivid main

REPOSITORY: deb.nodesource.com/node_0.12 vivid main

FILENAME: /etc/apt/sources.list.d/nodesource.list

1 package(s) installed



ENTRY: http://dl.google.com/linux/chrome/deb/ stable main

REPOSITORY: dl.google.com/linux

FILENAME: /etc/apt/sources.list.d/google-chrome.list

2 package(s) installed



ENTRY: http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu vivid main

PPA: ppa:gnome3-team/gnome3

FILENAME: /etc/apt/sources.list.d/gnome3-team-ubuntu-gnome3-vivid.list

273 package(s) installed



ENTRY: http://ppa.launchpad.net/noobslab/apps/ubuntu vivid main

PPA: ppa:noobslab/apps

FILENAME: /etc/apt/sources.list.d/noobslab-ubuntu-apps-vivid.list

0 package(s) installed



ENTRY: http://ppa.launchpad.net/ubuntuhandbook1/corebird/ubuntu vivid main

PPA: ppa:ubuntuhandbook1/corebird

FILENAME: /etc/apt/sources.list.d/ubuntuhandbook1-ubuntu-corebird-vivid.list

1 package(s) installed



ENTRY: http://ppa.launchpad.net/webupd8team/unstable/ubuntu vivid main

PPA: ppa:webupd8team/unstable

FILENAME: /etc/apt/sources.list.d/webupd8team-ubuntu-unstable-vivid.list

1 package(s) installed



ENTRY: http://download.mono-project.com/repo/debian wheezy main

REPOSITORY: download.mono-project.com/repo

FILENAME: /etc/apt/sources.list.d/mono-xamarin.list

166 package(s) installed



ENTRY: http://ppa.launchpad.net/otto-kesselgulasch/gimp-edge/ubuntu vivid main

PPA: ppa:otto-kesselgulasch/gimp-edge

FILENAME: /etc/apt/sources.list.d/otto-kesselgulasch-ubuntu-gimp-edge-vivid.list

5 package(s) installed



ENTRY: http://ppa.launchpad.net/numix/ppa/ubuntu vivid main

PPA: ppa:numix/ppa

FILENAME: /etc/apt/sources.list.d/numix-ubuntu-ppa-vivid.list

3 package(s) installed



ENTRY: http://ppa.launchpad.net/webupd8team/atom/ubuntu vivid main

PPA: ppa:webupd8team/atom

FILENAME: /etc/apt/sources.list.d/webupd8team-ubuntu-atom-vivid.list

1 package(s) installed



ENTRY: https://packages.graylog2.org/repo/debian/ trusty 1.0

REPOSITORY: packages.graylog2.org/repo

FILENAME: /etc/apt/sources.list.d/graylog.list

3 package(s) installed



ENTRY: http://ppa.launchpad.net/ubuntu-mate-dev/ppa/ubuntu vivid main

PPA: ppa:ubuntu-mate-dev/ppa

FILENAME: /etc/apt/sources.list.d/ubuntu-mate-dev-ubuntu-ppa-vivid.list

0 package(s) installed



ENTRY: http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu vivid main

PPA: ppa:gnome3-team/gnome3-staging

FILENAME: /etc/apt/sources.list.d/gnome3-team-ubuntu-gnome3-staging-vivid.list

268 package(s) installed



ENTRY: http://debian.koha-community.org/koha stable main

REPOSITORY: debian.koha-community.org/koha stable main

FILENAME: /etc/apt/sources.list.d/koha.list

0 package(s) installed



ENTRY: http://ppa.launchpad.net/pgavin/ghdl/ubuntu trusty main

PPA: ppa:pgavin/ghdl

FILENAME: /etc/apt/sources.list.d/pgavin-ubuntu-ghdl-vivid.list

0 package(s) installed



ENTRY: http://ppa.launchpad.net/ubuntu-mate-dev/vivid-mate/ubuntu vivid main

PPA: ppa:ubuntu-mate-dev/vivid-mate

FILENAME: /etc/apt/sources.list.d/ubuntu-mate-dev-ubuntu-vivid-mate-vivid.list

3 package(s) installed



ENTRY: http://ppa.launchpad.net/webupd8team/sublime-text-3/ubuntu vivid main

PPA: ppa:webupd8team/sublime-text-3

FILENAME: /etc/apt/sources.list.d/webupd8team-ubuntu-sublime-text-3-vivid.list

1 package(s) installed



ENTRY: http://ppa.launchpad.net/webupd8team/java/ubuntu vivid main

PPA: ppa:webupd8team/java

FILENAME: /etc/apt/sources.list.d/webupd8team-ubuntu-java-vivid.list

1 package(s) installed



ENTRY: http://dl.google.com/linux/chrome/deb/ stable main

REPOSITORY: dl.google.com/linux

FILENAME: /etc/apt/sources.list.d/google.list

2 package(s) installed



ENTRY: http://dl.google.com/linux/chrome/deb/ stable main

REPOSITORY: dl.google.com/linux

FILENAME: /etc/apt/sources.list.d/google-chrome-beta.list

2 package(s) installed

I don't know of an automatic way, but this method is fairly quick:

1. Start synaptic package manager and input your password when prompted




2. In the left column toward the bottom, click on Origin

All the ppas on your system will now be listed at the top of the left column. You can click down the list and see if any software is installed from each. (if there is, there will be a green box by the package name in the right column). If there are many packages from the ppa (too many to see on the screen at once), you can click on the S at the top of the right column to sort them by status.

NOTE: If you have any unused ppas:

1. Click Settings in the top menu


2. Then Repositories


3. 
   Software and Updates window will be displayed.


4. From this window you can remove the unused ppas from the Other Software tab.