Notes: Disable SSH Strict Host Checking

What automating tasks with ssh, it can be annoying to be prompted to confirm the authenticity of host.

The authenticity of host ' (NN.NN.NN.NN)' can't be established.
RSA key fingerprint is af:78:f8:fb:8a:ae:dd:55:f0:40:51:29:68:27:7e:7c.
Are you sure you want to continue connecting (yes/no)? 

Here's a simple way around that:

# This automatically adds the fingerprint to 
# ~/.ssh/known_hosts
ssh -o StrictHostKeyChecking=no

# This doesn't add fingerprint
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no