It's much more simpler if you use numbers as starting points:
Code:
START_POINT="$1"
if [ ! "$START_POINT" ]; then START_POINT=0; fi
if [ "$START_POINT" -le 10 ]; then echo "Running 10!"; fi
if [ "$START_POINT" -le 20 ]; then echo "Running 20!"; fi
if [ "$START_POINT" -le 30 ]; then echo "Running 30!"; fi
