Generate a private key
gpg --gen-key
Export a user key
gpg --export [UID]
Import a key
gpg --import [Filename]
Other samples
gpg --gen-revoke gpg --list-keys gpg --fingerprint
Protect your key
gpg --armor --output pubkey.txt --export 'Your Name'
Decrypt a file
cat x1.txt.gpg | gpg -d --output x1.txt