Automatically bump quotas for everyone, ignoring users without quota, and users with quotas already higher than the new default quota. Uses repquota, and generates a batch file suitable for input to setquota -b.
Use stack.
stack build
bumpquota --block-soft=1000000 --block-hard=1100000 --filesystem=/home | setquota -b /home
will raise any block quota on /home to the given amounts, leaving any users with higher quotas or users without quotas untouched. Also supports inode limits.