Linux verify ISO image file from command line

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2. checksum file (SHA512SUMS)
3. signature file (SHA512SUMS.sign)

Next we verified the checksum and signature files with the GPG command:

gpg --verify SHA512SUMS.sign

A message was returned stating: "gpg: Can't check signature: No public key". This message means that the public key isn't available on the system. We then used the following command to retrieve it:

We can now validate the checksum file with the command:

gpg --verify SHA512SUMS.sign SHA512SUMS

Finally we can verify the ISO image file with the command:

sha512sum --ignore-missing -c SHA512SUMS

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