List keys
gpg --list-keys
e.g.,
$ gpg --list-keys
/home/kevin.qiu/.gnupg/pubring.gpg
----------------------------------
pub 4096R/D39DC0E3 2014-10-28
uid Michal Papis (RVM signing) <mpapis@gmail.com>
pub 2048R/26DF03A6 2018-01-10
uid Kevin Qiu <kevin.qiu@points.com>
sub 2048R/E82277EE 2018-01-10
pub 4096R/A0FFD6F6 2015-04-11 [expires: 2025-04-08]
uid keybase.io/rajitha <rajitha@keybase.io>
sub 4096R/99E563E3 2015-04-11 [expires: 2025-04-08]
Export to a file
gpg --armor --export <keyid> > <email>.gpg.asc
Import from a file
cat <email>.gpg.asc | gpg --import