May 2017
Beginner
552 pages
28h 47m
English
Content preview from Linux Shell Scripting Cookbook - Third Edition
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DNS lookup
Several DNS lookup utilities provide name and IP address resolution from the command line. The host and nslookup commands are two commonly installed utilities.
The host command lists all of the IP addresses attached to a domain name:
$ host google.com google.com has address 64.233.181.105 google.com has address 64.233.181.99 google.com has address 64.233.181.147 google.com has address 64.233.181.106 google.com has address 64.233.181.103 google.com has address 64.233.181.104
The nslookup command maps names to IP addresses and will also map IP addresses to names:
$ nslookup google.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: google.com Address: 64.233.181.105 Name: google.com Address: 64.233.181.99