shell for 循环

for i in 1,2,3,4,5,6
do 
    echo $i;
    echo ii;
done

输出：
1,2,3,4,5,6
ii

for i in {1,2,3,4,5,6}
do
    echo $i;
    echo ii
done
输出：
1
ii
2
ii
3
ii
4
ii
5
ii
6
ii