Zapping stale kernel images on Ubuntu

Spring cleaning time, I wanted to keep my current kernel and the one just installed by a recent upgrade. That argument could have been simplified by using $(uname -r)

dpkg -l | grep linux-image | egrep -v '3.2.0-4(3|4)-generic' | grep -v linux-image-generic | awk '{print $2}' | xargs apt-get remove -y

and the results

...
0 upgraded, 0 newly installed, 25 to remove and 0 not upgraded.
After this operation, 7,807 MB disk space will be freed.