To restrict the amount of words of the content, you can use the cut parameter. If the content is less than the amount, then there won't be any dots added to the end. If there is content left over, then dots will be added and the rest of the content will be removed.
I am bringing in feed from my other blog but I want to have just of couple of lines of feed for each post. I assume (yeah, I know) from the above that feed.php is the place to adjust this but I do not know how to use the cut parameter.
Is this file the correct one and what is the code for cut?