How do you enter a blank password in ssh

im trying to log into an account via ssh, the account has no password and when i hit enter in the prompt in the terminal it just says password again, what do i do
ps no i cant just change the password on the other account

leaving aside the fact that allowing ssh access with a blank password is a monstrously bad idea...
you'd have to enable ssh with an empty password on the computer you are trying to ssh to. It is disabled by default (and a good thing that it is too!). this has to be done by and admin user on that computer by modifying the file /etc/sshd_config. see this link
http://www.osxfaq.com/man/8/sshd.ws
Unless this is done, there is nothing you can do on your end and you won't be able to ssh into that account.

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