bsd operating system

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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Can you explain me UNIX shell? What are Shells?

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How do I extract a single file or directory form a tarball under UNIX / Linux shell prompt? How do I restore a single file from /dev/st0 tape device?

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How do I delete a file under Linux / UNIX / BSD / AIX / HP-UX operating system?

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