/home/alex/.gnupg/pubring.gpg
-----------------------------
pub   2048R/0FDEC709 2017-08-11
uid                  alice <alice@mail.com>
sub   2048R/8B76560E 2017-08-11

pub   2048R/E500C1B1 2017-08-11
uid                  bob__ <bob@mail.com>
sub   2048R/B9D82FDE 2017-08-11

gpg --output message.encrypted --encrypt --recipient bob@mail.com message.plaintext

gpg --output message.decrypted --decrypt message.encrypted