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lsof command

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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Linux / UNIX: List Open Files for Process

Q. How do I list all open files for a Linux or UNIX process using command line options?
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Q. How do I find out which service is listening on a specific port? How do I find out what program is listening on a specific TCP Port?
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How do I find open ports on Linux / FreeBSD server?
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