@Luke

I don't know the internals of the shell...
Maybe a function like this will help:

unset_pass()
{
        [ -n "$1" ] || return 0
        eval "$1=\$(dd if=/dev/urandom bs=1k count=4 2>/dev/null)"
        unset $1
        return 0
}

unset_pass PASS

-- 
Should try given password for next partition
https://bugs.launchpad.net/bugs/139057
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