shell script (read -p)

#!/bin/bash

read -p "NUM: " val1           --> read 커맨드를 써서 값을 읽고 -p 옵션을 줘서 문자열을 출력하고 값을 얻어오는 방식을 이용해서 값을 3개 가져옴

read -p "NUM: " val2
read -p "NUM: " val3

if [[ $val1 -ge $val2 && val1 -ge $val3 ]]; then
        echo "MAX: $val1"
elif [[ $val2 -ge $val1 && val2 -ge $val3 ]]; then
        echo "MAX: $val2"
else
        echo "MAX: $val3"
fi