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並前往https://unix.stackexchange.com/questions/151654/checking-if-an-input-number-is-an-integer

Checking if an input number is an integer - Unix Stack Exchange

It not only works in bash but also any POSIX shell. From POSIX test documentation: n1 -eq n2 True if the integers n1 and n2 are algebraically equal; otherwise, ...

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