Encrypt file:
gpg --encrypt --armor --recipient email@example.com file
Decrypt file:
gpg --decrypt file
Export public key:
gpg --export --armor email@example.com > public.key
Import public key:
gpg --import public.key
Export private key:
gpg --export-secret-key --armor email@example.com > private.key
Import private key:
gpg --allow-secret-key-import --import private.key