nslookup命令–查询域名的DNS信息
nslookup命令的英文全称为 “query Internet name server interactively ”。nslookup命令主要用来查询域名的DNS信息。在使用nslookup之前，先确保已经安装了它，nslookup属于bind-utils包下一个命令 。
nslookup有两种工作模式：“交互模式”和“非交互模式”。在命令行中直接输入nslookup，无需输入任何参数即进入交互模式，由“>”提示。
-sil 不显示任何警告信息
exit 退出命令
server 指定解析域名的服务器地址
set type=soa 设置查询域名授权起始信息
set type=a 设置查询域名A记录
set type=mx 设置查询域名邮件交换记录
[root@linuxcool ~]# nslookup linuxcool.com
Server: 180.76.76.76
Address: 180.76.76.76#53
Non-authoritative answer:
Name: linuxcool.com
Address: 216.218.186.2
Name: linuxcool.com
Address: 2001:470:0:76::2
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