Configure remote access to git without erasing your existing keys

This is a solution if you'd like to connect to github using ssh (typical for read-write access to a repository) but you don't want to delete an existing ssh key (e.g., id_rsa) as requested in the git instructions. On ubuntu, I did it like this:

$ cd .ssh

$ ssh-keygen -t rsa -C "myemail@place.com"

Enter file in which to save the key (/home/username/.ssh/id_rsa): github_rsa
Enter a passphrase: your secret phrase

Copy the public key file ~/.ssh/github_rsa.pub to your github.com ssh settings.

Edit the file .ssh/config, and add the following entry (or create a new file if it doesn't currently exist)

Host github
  Hostname github.com
  User git
  IdentityFile ~/.ssh/github_rsa

Then, I had to do

$ ssh-add ~/.ssh/github_rsa

to get rid of an "Agent can't sign error"

Then, if you do

$ ssh -T github

you should see
Hi rhodricusack! You've successfully authenticated, but GitHub does not provide shell access.

Then you can do
git clone github:/rhodricusack/automaticanalysis