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Workaround:

Description: Lab ch.1 ask at point 2

"

Edit your newly created script file to comply with the following requested information from the servera and serverb hosts. The systems use SSH keys for authentication, and therefore you do not require a password."

and then in the table:

echo "#####"

Get all the output.

All senior system know that the correct command should be

echo "#####"

in the script, but
if you literally execute the request, someone could do:

ssh $HOST echo "#####"

that no produce any output,
I know that not have sense, but I suggest to reformulate request of hashes in table
 
HTH
Alessandro