I run this 3 commands and it install ruby 2.3 but after a restart it is gone

gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3

\curl -sSL https://get.rvm.io | bash -s stable --rails

source /usr/local/rvm/scripts/rvm