Multiple github accounts and ssh keys

multiple-ssh-config

# Default GitHub user (sandip)
Host github.com
  HostName github.com
  User git
  IdentityFile /home/sandip/.ssh/id_rsa

# github user (client)
Host github-client
  HostName github.com
  User git
  IdentityFile /home/sandip/.ssh/id_rsa_client

# github user (friend)
Host github-swapnil
  HostName github.com
  User git
  IdentityFile /home/sandip/.ssh/id_dsa_swapnil