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+Allow unattended passphrases to work, stop a GUI dialog when using a CLI app:
+
+```
+$ cat ~/.gnupg/gpg-agent.conf
+
+pinentry-program /usr/bin/pinentry-tty
+allow-loopback-pinentry
+```
+
+Reload the agent running in the background to update the above, as well as to force it to forget passphrases being cached in memory:
+
+```
+gpg-connect-agent reloadagent /bye
+```
+
+Encrypt and decrypt a file then test they match, order matters of CLI flags for decrypting.
+
+```
+gpg -c passwords_backup.csv
+gpg -o passwords_restored.csv -d passwords_backup.csv.gpg
+diff -uN passwords_backup.csv passwords_restored.csv
+```
+
+Use a keyserver with Let's Encrypt wrapped around it
+```
+$ cat ~/.gnupg/dirmngr.conf
+
+hkp-cacert /home/FOO/.gnupg/le.pem
+keyserver hkps://keys.openpgp.org
+```
+
+Set a default key to use
+```
+$ cat ~/.gnupg/gpg.conf
+
+default-key ABCD1234
+```