"To encrypt a File:"
gpg -o encrypted_file.gpg –encrypt -r original.file
# they didn't put recipient after -r ? gpg -o encrypted_file.gpg –encrypt -r original.file
# they didn't put recipient after -r ?gpg -e file
The output will be file.gpg. It will ask you for a recipient unless you have "default-recipient" or "default-recipient-selt" set in gpg.conf.