==== List Installed Software (Debian) ====
This will give you a list of software that was installed via command line;
<code>
comm -23 <(dpkg --get-selections | sed -n 's/\t\+install$//p'| sort) <(</var/lib/apt/extended_states awk -v RS= '/\nAuto-Installed: *1/{print$2}' | sort
</code>