1 #!/bin/bash
 2 case $1 in
 3   0) exit;;
 4   1) mogrify -rotate "-90" "$2"; exit;;
 5   2) mogrify -rotate "90" "$2"; exit;;
 6   3) exit;;
 7   4) exit;;
 8   5) exit;;
 9   6) exit;;
10   7) exit;;
11   8) exit;;
12   9) exit;;
13   *) echo "unrecognized command"; exit ;;
14 esac
15