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host
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===
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常用的分析域名查询工具
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## 说明
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**host命令** 是常用的分析域名查询工具，可以用来测试域名系统工作是否正常。
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### 语法
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```
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host(选项)(参数)
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```
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```
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-a：显示详细的DNS信息；
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-c<类型>：指定查询类型，默认值为“IN“；
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-C：查询指定主机的完整的SOA记录；
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-r：在查询域名时，不使用递归的查询方式；
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-t<类型>：指定查询的域名信息类型；
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-v：显示指令执行的详细信息；
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-w：如果域名服务器没有给出应答信息，则总是等待，直到域名服务器给出应答；
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-W<时间>：指定域名查询的最长时间，如果在指定时间内域名服务器没有给出应答信息，则退出指令；
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-4：使用IPv4；
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-6：使用IPv6.
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```
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### 参数
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主机：指定要查询信息的主机信息。
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### 实例
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```
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[root@localhost ~]# host www.jsdig.com
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www.jsdig.com is an alias for host.1.jsdig.com.
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host.1.jsdig.com has address 100.42.212.8
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[root@localhost ~]# host -a www.jsdig.com
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Trying "www.jsdig.com"
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34671
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
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;; QUESTION SECTION:
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;www.jsdig.com. IN ANY
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;; ANSWER SECTION:
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www.jsdig.com. 463 IN CNAME host.1.jsdig.com.
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Received 54 bytes from 202.96.104.15#53 in 0 ms
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```
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