for循环-等腰三角形

#!/bin/bash
read -p "请输入行数:" line
for ((i=1;i<=line;i++));do
   for ((k=1;k<=line-i;k++));do
   echo -e " \c"
   done
   for ((j=1;j<=2*i-1;j++));do
   echo -e  "*\c"
   done
   echo 
done