# List public keys
gpg --list-keys
# List private keys
gpg --list-secret-keys --keyid-format=long
# Export private key
gpg --armor --export-secret-keys <key-id> > <key-file>
# Import private key
gpg --import <key-file>
# Change trust level manually
gpg --edit-key <key-id> trust quit
# Export ownertrust
gpg --export-ownertrust > <ownertrust-file>
# Import ownertrust
gpg --import-ownertrust < <ownertrust-file>
# Tell Git about GPG key
git config --global user.signingkey <key-id>
# Config Git to commit with GPG key
git config --global commit.gpgsign true