list ppa on *nix system

list-ppa

#!/usr/bin/env bash

# get all the PPAs installed on a system ready to share for reininstall
for APT in `find /etc/apt/ -name \*.list`; do
    # list found files - helps in case of: '... public key is not available: NO_PUBKEY'
    echo $APT
    grep -o "^deb http://ppa.launchpad.net/[a-z0-9\-]\+/[a-z0-9\-]\+" $APT | while read ENTRY ; do
        USER=`echo $ENTRY | cut -d/ -f4`
        PPA=`echo $ENTRY | cut -d/ -f5`
        echo sudo apt-add-repository ppa:$USER/$PPA
        echo sudo ppa-purge ppa:$USER/$PPA
    done
done