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host command

How to Set Up DNS Lookup in Linux

Q. How do I setup DNS Lookup under any Linux distribution ?
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Q. I'm not able to run nslookup or host command under Debian or Ubuntu Linux. In fact, these commands are missing from my installation. How do I install nslookup and related dns client commands?
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I'm using CentOS Linux server version 5.x/6.x+. How do I configure a system so that the DNS resolver will append search path extensions to hostnames that have dots in them? For example, my domain name is test.com. when I query for mail hostname it should append .test.com and return the IP address of mail.test.com hostname.
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