public keyring, and "non-exportable" stuff ¶
this includes local signatures
to a file ¶
gpg --export --export-options export-backup >file ... gpg --import --import-options import-restore >file
directly over ssh ¶
gpg --export --export-options export-backup | ssh user@host -- gpg --import --import-options import-restore
trust values ¶
to a file ¶
gpg --export-ownertrust >file ... gpg --import-ownertrust >file
directly over ssh ¶
gpg --export-ownertrust | ssh user@host -- gpg --import-ownertrust
secret keys ¶
note that since importing a password-protected secret key asks for the password, it is difficult to do while piping over ssh.
gpg --export-secret-keys >file ... gpg --import file
just the subkeys ¶
you can instead share only the secret subkeys with a less-trustworthy computer (such as a laptop you take with you) so that you can revoke them and create new subkeys, without the hassle of your entire key needing to be revoked.
gpg --export-secret-subkeys >file ... gpg --import file