# Fixing “WARNING: UNPROTECTED PRIVATE KEY FILE!” on Linux
sudo chmod 755 ~/.ssh;
sudo chmod 600 ~/.ssh/authorized_keys
sudo chmod 600 ~/.ssh/id_rsa;
sudo chmod 600 ~/.ssh/id_rsa.pub;
sudo chmod 644 ~/.ssh/known_hosts;
# http://www.howtogeek.com/168119/fixing-warning-unprotected-private-key-file-on-linux/
# https://stackoverflow.com/a/33708140/2618535