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?

Accepted Answer

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

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

Solution