Which private key file in private-keys-v1.d directory belongs to which key? : <p>Since GnuPG 2.1 (<a href="https://www.gnupg.org/faq/whats-new-in-2.1.html" rel="noreferrer">https://www.gnupg.org/faq/whats-new-in-2.1.html</a>), private keys of GnuPG are stored in the <code>private-keys-v1.d</code> subdirectory. After experimenting with key creation etc., I found that I have several <code>*.key</code> files in this directory:</p>

<pre><code>$ ls .gnupg/private-keys-v1.d
xxxxxxxxxxxxxxxxxxxxxxxxxxxx.key
yyyyyyyyyyyyyyyyyyyyyyyyyyyy.key
zzzzzzzzzzzzzzzzzzzzzzzzzzzz.key
...
</code></pre>

<p>The file names (x+, y+ and z+) looks like fingerprints etc., but are not equal to any of my existing public keys. How can I find which key file in this directory belongs to which key visible with <code>gpg --list-keys</code>?</p>
