gistfile1.txt

 % sudo apt-key adv –-keyserver hkp://keyserver.ubuntu.com:80 –-recv-keys 0x219BD9C9                                                                ~ ip-10-184-190-213
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.fSusK66Pn3 --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg –-keyserver hkp://keyserver.ubuntu.com:80 –-recv-keys 0x219BD9C9
usage: gpg [options] [filename]