linux shell脚本写循环结构

例子（Demo）:

x=10

for _ in 1 2;do
# for _ in 1 2;do

for i in 1 2 3 ;
do
    for j in 4 5 6;
        do echo "${i} ${j}" &&
                echo "xyz_${i} ${j}"
    done
done
 

x=20

echo "/home/xyz ${x}"

done

运行情况：