Md5 checksum is used to verify the integrity of files, as virtually any change to a file will cause its MD5 hash to change. Most commonly, md5 checksum is used to verify that a file has not changed as a result of a faulty file transfer, a disk error or non-malicious meddling.
The “md5sum” program is included in most Unix-like operating systems, or compatibility layers such as Cygwin.
Please note that the following step is optional.
On linux based systems, the command is md5sum <upgrade.tar.gz>, on mac, the command is md5 <upgrade.tar.gz> and on windows, the command is “CertUtil -hashfile <upgrade.tar.gz> MD5>. Verify that the output of the command’s md5 checksum is the same as the one in the md5sum file.