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administrative tool

Reverse nslookup Command

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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FreeBSD Install lsof To Displays Information About Files Open to Unix processes

Q. 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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