A lot of programs in my Ubuntu install are rarely used but important. Programs which are not installed by default but I installed them after I read about them from somewhere.
Some examples are:
youtube-dl
exiftool
and there are couple of others I don't remember right now. Some ppas have been added. Some tweaks to make things work.
My question is: How do I keep a track of what's installed in my computer when I move to a new PC or reinstall Ubuntu (or Linux)? How do you remember tweaks installed or ppas added?
edit: Using Ubuntu 14.04
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