How can I get a list of all repositories and PPAs from the command line into an install script?

You can show everything with:

grep ^ /etc/apt/sources.list /etc/apt/sources.list.d/*

Thanks for the pointers. With a little cleanup I got a script that lists the PPAs, but not any other repository:

#! /bin/sh 
# listppa Script to get all the PPA installed on a system ready to share for reininstall
for APT in `find /etc/apt/ -name \*.list`; do
    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
    done
done

When you call it with listppa > installppa.sh you get a script you can copy on a new machine to reinstall all PPA.

Next stop: do that for the other repositories:

#! /bin/sh
# Script to get all the PPA installed on a system
for APT in `find /etc/apt/ -name \*.list`; do
    grep -Po "(?<=^deb\s).*?(?=#|$)" $APT | while read ENTRY ; do
        HOST=`echo $ENTRY | cut -d/ -f3`
        USER=`echo $ENTRY | cut -d/ -f4`
        PPA=`echo $ENTRY | cut -d/ -f5`
        #echo sudo apt-add-repository ppa:$USER/$PPA
        if [ "ppa.launchpad.net" = "$HOST" ]; then
            echo sudo apt-add-repository ppa:$USER/$PPA
        else
            echo sudo apt-add-repository \'${ENTRY}\'
        fi
    done
done

This should do the trick. I needed a question on superuser to figure out the correct regex.

I am surprised that the simplest but most effective way to get all enabled binary software sources together with the file they're specified in hasn't been posted yet:

grep -r --include '*.list' '^deb ' /etc/apt/sources.list /etc/apt/sources.list.d/

From all processed files, this will print every line starting with deb. This excludes commented lines as well as deb-src lines to enable source code repositories.

It searches really only all *.list files that will be parsed by apt, but e.g. no *.list.save files used for backup or others with illegal names.

---

If you want a shorter but possibly only in 99.9% of all cases correct output that may search too much files (includes all /etc/apt/sources.list* files and directories, not only /etc/apt/sources.list and `/etc/apt/sources.list.d/*), you could also use this:

grep -r --include '*.list' '^deb ' /etc/apt/sources.list*

Unless there are files that shouldn't be there, the output will be the same.

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An example output on my machine would be this:

/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily main restricted
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates main restricted
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily universe
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates universe
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily multiverse
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates multiverse
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-backports main restricted universe multiverse
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security main restricted
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security universe
/etc/apt/sources.list:deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security multiverse
/etc/apt/sources.list:deb http://archive.canonical.com/ubuntu wily partner
/etc/apt/sources.list.d/maarten-fonville-ubuntu-ppa-wily.list:deb http://ppa.launchpad.net/maarten-fonville/ppa/ubuntu wily main
/etc/apt/sources.list.d/webupd8team-ubuntu-tor-browser-wily.list:deb http://ppa.launchpad.net/webupd8team/tor-browser/ubuntu wily main
/etc/apt/sources.list.d/fossfreedom-ubuntu-indicator-sysmonitor-wily.list:deb http://ppa.launchpad.net/fossfreedom/indicator-sysmonitor/ubuntu wily main
/etc/apt/sources.list.d/getdeb.list:deb http://archive.getdeb.net/ubuntu wily-getdeb apps

---

If you want prettier output, let's pipe it through sed:

grep -r --include '*.list' '^deb ' /etc/apt/ | sed -re 's/^\/etc\/apt\/sources\.list((\.d\/)?|(:)?)//' -e 's/(.*\.list):/\[\1\] /' -e 's/deb http:\/\/ppa.launchpad.net\/(.*?)\/ubuntu .*/ppa:\1/'

And we will see this:

deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily main restricted
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates main restricted
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily universe
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates universe
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily multiverse
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-updates multiverse
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-backports main restricted universe multiverse
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security main restricted
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security universe
deb http://ftp-stud.hs-esslingen.de/ubuntu/ wily-security multiverse
deb http://archive.canonical.com/ubuntu wily partner
[maarten-fonville-ubuntu-ppa-wily.list] ppa:maarten-fonville/ppa
[webupd8team-ubuntu-tor-browser-wily.list] ppa:webupd8team/tor-browser
[fossfreedom-ubuntu-indicator-sysmonitor-wily.list] ppa:fossfreedom/indicator-sysmonitor
[getdeb.list] deb http://archive.getdeb.net/ubuntu wily-getdeb apps