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dig
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===
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域名查询工具
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## 补充说明
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**dig命令** 是常用的域名查询工具，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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dig(选项)(参数)
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```
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```
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@<服务器地址>：指定进行域名解析的域名服务器；
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-b<ip地址>：当主机具有多个IP地址，指定使用本机的哪个IP地址向域名服务器发送域名查询请求；
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-f<文件名称>：指定dig以批处理的方式运行，指定的文件中保存着需要批处理查询的DNS任务信息；
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-P：指定域名服务器所使用端口号；
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-t<类型>：指定要查询的DNS数据类型；
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-x<IP地址>：执行逆向域名查询；
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-4：使用IPv4；
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-6：使用IPv6；
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-h：显示指令帮助信息。
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```
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### 参数
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* 主机：指定要查询域名主机；
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* 查询类型：指定DNS查询的类型；
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* 查询类：指定查询DNS的class；
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* 查询选项：指定查询选项。
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### 实例
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```
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[root@localhost ~]# dig www.jsdig.com
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; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5_8.1 <<>> www.jsdig.com
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;; global options: printcmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2115
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;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 0
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;; QUESTION SECTION:
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;www.jsdig.com. IN A
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;; ANSWER SECTION:
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www.jsdig.com. 0 IN CNAME host.1.jsdig.com.
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host.1.jsdig.com. 0 IN A 100.42.212.8
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;; AUTHORITY SECTION:
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jsdig.com. 8 IN NS f1g1ns2.dnspod.net.
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jsdig.com. 8 IN NS f1g1ns1.dnspod.net.
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;; Query time: 0 msec
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;; SERVER: 202.96.104.15#53(202.96.104.15)
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;; WHEN: Thu Dec 26 11:14:37 2013
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;; MSG SIZE rcvd: 121
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```
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