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* Zero or negative number doesn't make sense for -n option so raise an error * The shortest valid string to be printed is 1 character, but the default -n4 is more useful * Previously -n0 was incorrectly interpreted as -n4 and -n-100 was kind of interpreted as -n0 (empty strings were printed) * Print program name in error if open() failed * Sprinke "my" so strict will work
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