shell 输出九九乘法表

#/bin/bash
i=1
j=1
 while(($i<10))
   do
          while(($j<=$i))
            do
            echo -ne $j×$i=$[$j*$i]"	"
           j=$[$j+1]
           done
  echo
  j=1
  i=$[$i+1]
  done
echo