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bsd operating system

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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What Are Linux / UNIX Shells?

Can you explain me UNIX shell? What are Shells?
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Q. 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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Linux / UNIX: Delete a file

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