许多命令式控制依赖破坏性赋值进行迭代。
Many imperative control structures rely on destructive assignment to do iteration.
命令式编程的用户对赋值的依赖要超过其他编程技术。
Users of imperative languages rely on assignments more than any other programming technique.
还要注意，crontab可以包含shell变量赋值，这些赋值会在运行命令之前执行。
Note also that the crontab can include shell variables assignments that will be set before the commands are run.
声明：一组表示一种命令或者动作的代码，目前我们了解的只有赋值语句和打印语句。
A section of code that represents a command or action. So far, the statements we have seen are assignments and print statements.
声明：一组表示一种命令或者动作的代码，目前我们了解的只有赋值语句和打印语句。
A section of code that represents a command or action. So far, the statements we have seen are assignments and print statements.
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