Returning non-zero status in case of error in parameters #62
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Knowing when something happened correctly and when an error occurred is important when using zopflipng in other scripts. In special, if the help message is printed without passing `-h` or `--help`, it happened because of wrong or missing parameters, and should return a non-zero status. However, passing `-h` or `--help` will return 0.
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Knowing when something happened correctly and when an error occurred is important when using zopflipng in other scripts.
In special, if the help message is printed without passing
-hor--help, it happened because of wrong or missing parameters, and should return a non-zero status. However, passing-hor--helpwill return 0.