setting multiple private key for ssh

gistfile1

1.
ssh-keygen -t rsa -f ~/.ssh/id_rsa.work -C "Key for Word stuff"

2.
touch ~/.ssh/config
chmod 600 ~/.ssh/config
echo "IdentityFile ~/.ssh/id_rsa.work" >> ~/.ssh/config
echo "IdentityFile ~/.ssh/id_rsa.misc" >> ~/.ssh/config


3. more detailed config (default to ~/.ssh/id_dsa or ~/.ssh/id_rsa if no match)
Host *.home
  IdentityFile ~/.ssh/id_dsa.home
  User king123

Host *.vpn
  IdentityFile ~/.ssh/id_rsa.work
  User yaya
  Port 2222

Host *.vm
  IdentityFile ~/.ssh/id_rsa.vm
  User whatisup
  Port 22