Linux MD5 is widely used to check whether a file you’ve downloaded from the web is not corrupted, either by a virus or by the interruption in the discharge or noise in the connection so we must have the md5 sum of the file in question is eg a distro of GNU / Linux.

Example for md5:

$ Md5sum xxxx.iso

it gives the result of an key

now you need check wtheather the key matches are not with below steps

$ Md5sum xxxxx.iso xxxx.md5

And if the output, put that there is no need to add> to it before putting the  cheksum

$ Md5sum xxxxxxx.iso > xxxxx.md5

now you need to check md5

$ Md5sum-c xxxxx.md5

xxxxxxx.iso:  sum matches