Shell并没有提供大量的算术操作符，但是已经足以完成大多数编程任务，包括移位、求余和比较。

The shell doesn't have a large collection of arithmetic operators, but it's sufficient for most programming tasks, including bitwise shifts, remainders, and comparisons.

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运算符对数值执行常见计算，其中包括将数值的位模式移位。

Arithmetic Operators perform familiar calculations on numeric values, including shifting their bit patterns.

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然而，按位运算符和移位运算符永远不会导致溢出。

However, bitwise operators and shift operators never cause overflow.

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