~$ md5sum -c /media/sr0 KNOPPIX_V7.4.0DVD-2014-08-01-EN.iso
Oh, no!
Change to the download directory, where your KNOPPIX_V7.4.0DVD-2014-08-01-EN.iso download is and the download of the KNOPPIX_V7.4.0DVD-2014-08-01-EN.iso.md5 file. After this use
Code:
md5sum -c KNOPPIX_V7.4.0DVD-2014-08-01-EN.iso.md5