可靠的系统处理和命令加密。

Reliable systems processing and commanding encryption.

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例如，管理员可能处理任务中的异常(例如，无效的命令、系统崩溃)。

For example, an administrative staff could handle an exception in a task (for example, invalid order, system failure).

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exec—这个方便的php函数发送一个字符串供操作系统的命令行处理。

Exec -this handy PHP function sends a string for the operating system's command line to process.

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