Cli 参数格式建议
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square brackets [optional option]
angle brackets <required argument>
curly braces {default values}
parenthesis (miscellaneous info)


Text without brackets or braces	        Items you must type as shown.
<Text inside angle brackets>	        Placeholder for which you must supply a value.
[Text inside square brackets]	        Optional items.
{Text inside braces}	                Set of required items. You must choose one.
Vertical bar (|)	                    Separator for mutually exclusive items. You must choose one.
Ellipsis (…)	                        Items that can be repeated and used multiple times.