GNU Privacy Guard

gpg

gpg --list-secret-keys List secret keys and associated information

Export/Import

gpg --export-secret-keys -a <keyid> > <filename.asc> Export private gpg key
gpg --export -a <keyid> > <filename.asc> Export public gpg key
gpg --import <filename.asc> Import private gpg key
gpg --import <filename.asc> Import public gpg key