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When you are on a terminal, just hit \ and enter to continue command in the next line.

Example:

>echo "Hello \
> World! "
Hello World!

You need to initialize the variable prior to the while loop test. The line above contains "finsh" instead of "finish"

Hi, $finish does not get initialized prior to the while loop. One the line above that there is probably a typo, but even if it were set to zero, the while loop would not be entered..

Is this what you are trying to achieve:-
echo "\$mmc"

Ah, use single quotes. '$mmc' and it will not substitute.

I don't know why you'd want that, as $mmc in a text file isn't really useful. It will be very difficult to turn it back into a variable...