a.py 



import sys
print(".".join(sys.version.split()[0].split(".")[:2]))


test.sh



#!/bin/sh
zero=0
x=`python a.py`
y="3.6"
status=`echo "$x >= $y" | bc`
echo $status

if [[ $status -eq $zero ]];then
        echo "bu >=  3.6"
else
        echo ">=  3.6"
fi


输出



bogon:Desktop macname$ ./test.sh 
0
bu >=  3.6


 

test.sh



#!/bin/sh
zero=0
x=`python3 a.py`
y="3.6"
status=`echo "$x >= $y" | bc`
echo $status

if [[ $status -eq $zero ]];then
        echo "bu >=  3.6"
else
        echo ">=  3.6"
fi


输出



bogon:Desktop macname$ ./test.sh 
1
>=  3.6


 

 

参考：

http://ju.outofmemory.cn/entry/62675

https://zhidao.baidu.com/question/391954555815798765.html