rotating circle in shell script

gistfile1.sh

## --> rotating circle from characters
# --> from http://stackoverflow.com/questions/10470139/creating-rotating-circle-using-characters-in-shell-script

while sleep 1; do 
  i=$((++i%4 + 2)); 
  printf '\b|/-\' | cut -b 1,$i | tr -d '\n';
done