shell 数组

for n in {1..20};do
if [ $(($n%2)) == "1" ];then
#echo $n 是基数;
a=$(echo $a $n)
else
#echo $n 是偶数;
b=$(echo $b $n)
fi
done
echo $a
echo $b

for n in {1..20};do
case $(($n%3)) in
0)
a=$(echo $a $n);;
1)
b=$(echo $b $n);;
2)
c=$(echo $c $n);;
esac
done
echo $a
echo $b
echo $c