[mlzboy@localhost ~]$ echo "a" > a.txt
[mlzboy@localhost ~]$ echo "b" > b.txt
[mlzboy@localhost ~]$ echo "a" > c.txt
[mlzboy@localhost ~]$ md5sum a.txt
60b725f10c9c85c70d97880dfe8191b3 a.txt
[mlzboy@localhost ~]$ md5sum b.txt
3b5d5c3712955042212316173ccf37be b.txt
[mlzboy@localhost ~]$ md5sum c.txt
60b725f10c9c85c70d97880dfe8191b3 c.txt
concluation:
md5sum only check the content didn't contains date etc...
