$ ls /etc/apt/sources.list.d
dropbox.list
dropbox.list.distUpgrade
dropbox.list.save
google-talkplugin.list
google-talkplugin.list.distUpgrade
google-talkplugin.list.save
gviz-adm-graphviz-dev-precise.list
gviz-adm-graphviz-dev-precise.list.distUpgrade
gviz-adm-graphviz-dev-precise.list.save
kubuntu-ppa-ubuntu-next-utopic.list
kubuntu-ppa-ubuntu-next-utopic.list.save
philschmidt-ppa-kio-mtp-daily-precise.list
philschmidt-ppa-kio-mtp-daily-precise.list.distUpgrade
philschmidt-ppa-kio-mtp-daily-precise.list.save
saiarcot895-ubuntu-myppa-utopic.list
saiarcot895-ubuntu-myppa-utopic.list.save
spotify.list
spotify.list.distUpgrade
spotify.list.save
stebbins-handbrake-releases-precise.list
stebbins-handbrake-releases-precise.list.distUpgrade
stebbins-handbrake-releases-precise.list.save
tuxpoldo-btsync-saucy.list
tuxpoldo-btsync-saucy.list.distUpgrade
tuxpoldo-btsync-saucy.list.save
typesafe-apt.list
typesafe-apt.list.distUpgrade
typesafe-apt.list.save
ubuntu-wine-ppa-saucy.list
ubuntu-wine-ppa-saucy.list.distUpgrade
ubuntu-wine-ppa-saucy.list.save
webupd8team-java-precise.list
webupd8team-java-precise.list.distUpgrade
webupd8team-java-precise.list.save
webupd8team-java-raring.list
webupd8team-java-raring.list.distUpgrade
webupd8team-java-raring.list.save
webupd8team-ubuntu-java-utopic.list
webupd8team-ubuntu-java-utopic.list.save
webupd8team-unstable-precise.list
webupd8team-unstable-precise.list.distUpgrade
webupd8team-unstable-precise.list.save
xorg-edgers-ubuntu-ppa-utopic.list
xorg-edgers-ubuntu-ppa-utopic.list.bak
xorg-edgers-ubuntu-ppa-utopic.list.save