I have two private keys in my keyring (let's call them PrivateKey#1 and PrivateKey#2). I need to sign a friend's public key that I imported. I want to sign the public key with PrivateKey#2. But when using Terminal and inputting
gpg --sign-key 0xFriendsPublicKey
It always tries to sign with PrivateKey#1.
How do I specify that I want to sign with PrivateKey#2?