Upgrade Crunchbang from wheezy/waldorf to janice/jessie (stable to testing) simplified

Following jschueths's post Updating Crunchbang to the Next Release I decided to use SED to make everything easier, instead of making the changes one-by-one by hand.

We should probably make backups of the files we are modifying first:

$ sudo cp /etc/apt/sources.list /etc/apt/sources.list.waldrof

$ sudo cp /etc/apt/preferences /etc/apt/preferences.waldrof

Then one command to make all the modifications:

$ sudo sed -i 's/waldorf/janice/g;s/wheezy/jessie/g' /etc/apt/sources.list /etc/apt/preferences

Then as jschurths said:

$ sudo apt-get update

$ sudo apt-get --no-install-recommends dist-upgrade