Automate ssh-keygen -t rsa so it does not ask for a passphrase

Question

I need to automate ssh-keygen -t rsa with out a password i.e. enter at the prompt.
How can I do that from a shell script?

Answer 1

To generate a SSH keypair without being prompted for a passphrase you can do the following:

$ ssh-keygen -f id_rsa -t rsa -N ''