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並前往https://www.log2base2.com/shell-script-examples/conditional/positive-or-negative-shell-script.html

Shell script to check whether a number is positive or negative

1. Get a number · 2. if number < 0, "echo negative" · 3. elif number > 0, "echo positive" · 4. else (num == 0), "echo neither Positive nor Negative" ...

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