ubuntu Linux systems are two ways to view the machine's dns

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1. cat /etc/resolv.conf

Get
nameserver 114.114.114.114

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2. nslookup [host]

Example:

$ nslookup www.baidu.com
Server: 114.114.114.114
Address: 114.114.114.114#53

Non-authoritative answer:
www.baidu.com canonical name = www.a.shifen.com.
Name: www.a.shifen.com
Address: 14.215.177.38
Name: www.a.shifen.com
Address: 14.215.177.39