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    -eq will compare them as integers, = will compare them as strings. You don't need to convert the string first. Commented Sep 20, 2015 at 5:07
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    I can't reproduce that error. What was the original value of $a, and what is the exact statement you used? Commented Sep 20, 2015 at 5:10
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    What's the difference between your third and fourth options? Commented Sep 20, 2015 at 6:48