administrative tool

How do I use nslookup command line administrative tool for testing and troubleshooting DNS servers including reverse lookup under UNIX or Windows operating systems? How do I look up an IP address of a domain or host on a network using nslookup command?

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How do I install the free, open-source, Unix administrative tool called lsof (for LiSt Open Files) under FreeBSD operating system to displays information about files open to Unix processes?

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