http://privex.i2p/articles/what-is-gpg
prompt, and just encrypt the message immediately: user@host $ gpg -r
[email protected] -ae hello.txt
gpg: checking the trustdb
gpg: marginals needed: 3 completes needed: 1
trust model: pgp
gpg: depth: 0 valid: 1 signed: 1
trust: 0-, 0q, 0n, 0m, 0f, 1u
gpg: depth: 1 valid: 1 signed: 0
trust: 1-, 0q, 0n, 0m, 0f, 0u
gpg: next trustdb check due at 2023-01-19 Signing and verifying a file / message to show that you approve a message, or verify...