Hi, welcome to these forums. Could you elaborate some more on what your problem is and what you are trying to accomplish?
Perhaps something like this may give you some idea:
Code:
echo 'enter "num1" operation "num2" (space separated)'
while read num1 operation num2
do
case $operation in
(+) result=$((num1 + num2)) ;;
(-) result=$((num1 - num2)) ;;
(\*) result=$((num1 * num2)) ;;
(/) result=$((num1 / num2)) ;;
(*) result="Invalid input"
esac
printf "%s\n" "$result"
done
