How do I SSH to machine A via B in one Command Jump Host ?

To SSH to a server through another server, you can use a feature of SSH called "SSH tunneling" or "SSH forwarding". This allows you to create a secure encrypted tunnel between your local machine and the remote server via an intermediate server.

Here are the general steps to set up SSH tunnelling:

Open a terminal (Control + Alt +T) on your local machine and type the following command:

More about : SSH-KEYGEN , SSH-COPY-ID , RSA , DSA & ECDSA