为从系统控制台输入操作员命令，只需指定一个命令输入缓冲区。
Only one CIB need be specified for operator commands entered from the system console.
如果必需的值之一是None，就意味着没有指定一个命令行选项。
If one of the required values is None, this means that one of the command line option was not specified.
“命令行”中，指定一个命令，就像在命令提示符处指定命令一样。
Command Line, specify a command as if you were specifying it at the command prompt.
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