Host github.com
  User git
  Port 22
  Hostname github.com
  IdentityFile spec/github_rsa
  TCPKeepAlive yes
  IdentitiesOnly yes

Host gist
  User git
  Port 22
  Hostname gist.github.com
  IdentityFile spec/github_rsa
  TCPKeepAlive yes
  IdentitiesOnly yes