bash计算浮点数

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