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I can see why that didn't work. `cat file` isn't just a useless use of cat, it also doesn't do what you want -- it will split on all whitespace, not just lines.

Did you try any of our suggestions...

What did you do, and in what way did it not work?

Tell us exactly what happens, word for word, letter for letter, keystroke for keystroke, otherwise we're just guessing.

Another rewrite:

OLDIFS="$IFS"
IFS=","

while IFS="$OLDIFS" read KEY...