转: Linux shel浮点l除法，精确到指定小数位数

https://blog.csdn.net/naiveloafer/article/details/8783518

2) echo "scale=2;$a/$b" | bc
结果为 1.71

percent=`echo "scale=2; $total_get * 100 / $pro_num "|bc`

[popexizhi: scale= 指定位数， bc 确定浮点数计算]