To import somebody's public key:
gpg --import your_friend.pub
To encrypt a text file for them:
gpg -a -se -r 'friend name in address book' FILENAME.txt
To list the keys (your friends') in your address book:
gpg --list-keys
To import a new friend's key:
gpg --import friend_key.pub
To generate a new private key for yourself:
gpg --full-generate-key
or
gpg --default-new-key-algo rsa4096 --gen-key
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