Bash scripts

yesno.sh

while true
do
    echo -n "Please confirm (y or n) :"
    read confirm
    case $confirm in
      y|Y|YES|yes|Yes)
        break
        ;;
      n|N|no|NO|No)
        echo Aborting - you entered $confirm
        exit
      ;;
      *) echo Please enter only y or n
    esac
done
echo You entered $confirm. Continuing ...