How to make GnuPG display full 8-byte/64-bit key ID?

Alternatively you can use:

gpg --keyid-format LONG -k 0xDEADBEEF

Or:

gpg --keyid-format 0xLONG -k 0xDEADBEEF

You can see the long key ID using the option --with-colons (yes, very intuitive).

To print only the long key ID, use something like:

$ gpg --list-keys --with-colons XXXXXXXX | awk -F: '/^pub:/ { print $5 }'

Just to point out a sanely named option to remember,

GnuPG 2.2.13 on macOS Catalina 10.15.4, --list-signatures option displays the key ID as well:

$ gpg --list-signatures

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