get launchpad PPA's keys

get_launchpad_keys.sh

#!/bin/sh

for i in `perl -nle'print "https://launchpad.net/~$1/+archive/ppa" if m!deb\s+http://ppa\.launchpad\.net/(.+?)/!' /etc/apt/sources.list`; do
    wget -q -O- "`wget -q -O- "$i" | perl -nle'print "http://keyserver.ubuntu.com:11371/pks/lookup?op=get&search=0x$1" if m!"http://keyserver.ubuntu.com:11371/pks/lookup\?search=.+?([[:xdigit:]]{16})&!'`" | sudo apt-key add -
done