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Like I said, take a look at the source code for sed. You should be able to find it on gnu.org . As long as a) you don't copy/paste the code and b) if you do, you don't redistribute it then the GPL won't come into play...
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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