echo "2 / 3" | bc -l
.66666666666666666666
如果想要前导零
echo "2 / 3" | bc -l | xargs printf "%f"
这里还有一堆解决方案:https://stackoverflow.com/questions/8402181/how-do-i-get-bc1-to-print-the-leading-zero
参考文献
https://blog.csdn.net/hanhaixingchen/article/details/71707566
bash做运算是真的烦。有点想转python了