Bash shell help

[Carl Parrish]

in a bash shell how do you just "hit enter?" I've got a script that's
supposed to enter a password. In this case I've already used ssh2 and a
keygen so I don't need to enter a passwd I just need to "enter" a blank.
I can pass a password to the cmd line just fine. And maybe its because I
haven't sleeped in 28 hours but I can't remember how to do *just* send a
blank line. 

HELP. 
-- 
Carl Parrish (cparrish@carlparrish.com)
http://www.carlparrish.com
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Registered Linux User #295761 http://counter.li.org