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networking program

Linux / UNIX Find Out What Program / Service is Listening on a Specific TCP Port

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 To Check and Use Serial Ports Under Linux

How do I check and configure serial ports under Linux for various purposes such as modem, connecting null modems or connect a dumb terminal?
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