fuser command

How do I find out what is listing or using tcp port number 80 on Linux based systems using command line options?

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How do I find out running processes were associated with each open port? How do I find out what process has open tcp port 111 or udp port 7000 under Linux?

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I’ve Ubuntu Linux Installed on HP Desktop system. When I press the eject button on my DVD / CD drive nothing happens. Linux is not ejecting my DVD and I had to reboot my computer to just get CD out of drive. How do I fix this issue?

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