使用此方法，您仅需一个命令就可以启动任意数量的规则。
Using this method, you can start any number of rules with a single command.
第二条命令只是从OUT put链删除编号为3的规则。
The second command simply deletes rule number 3 from the OUTPUT chain.
规则1是默认规则，无法使用此命令修改。
Rule 1 is the default rule and can't be changed with this command.
第三条命令指定该规则将与除来自源地址203.16.1.89外的任何信息包匹配。
The third command specifies that this rule will match any packets not from source address 203.16.1.89.
a或——append：该命令将一条规则附加到链的末尾。
A or — append: This command appends a rule to the end of a chain.
该命令将一条规则附加到链的末尾。
在依赖项(或规则)和命令块之间不能出现空行。
No blank line can appear between the dependency or rule and the commands block.
在依赖项(或规则)和命令块之间不能出现空行。
No blank line can appear between the dependency or rule and the commands block.
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