enable SSH user equivalency

Hi,

In document:

https://docs.oracle.com/database/121/TDPRC/softpatch2.htm#TDPRC430

It says:

2-Start the SSH agent and load the SSH keys into memory using the following commands:

$ /usr/bin/ssh-agent $SHELL $ /usr/bin/ssh-add

These commands start the ssh-agent on the local node, and load the RSA and DSA keys into the current session's memory so that you are not prompted to use pass phrases when issuing SSH commands.

And just after that it says:

3-At the prompt, enter the pass phrase for each key

I am confused.

Thank for explanation.