remove old versions of snap packages

remove_old_snap.sh

#!/bin/bash
# Removes old revisions of snaps
# CLOSE ALL SNAPS BEFORE RUNNING THIS

echo "Size before cleanup"
du -h /var/lib/snapd/snaps

set -eu
snap list --all | awk '/disabled/{print $1, $3}' |
while read snapname revision; 
do
        snap remove "$snapname" --revision="$revision"
done

echo "Size after cleanup"
du -h /var/lib/snapd/snaps