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I want to know the right command to type from a bash shell so that i can 1) Check the version of my cent os 2) Check all the open ports (tcp and udp) on my machine 3) Open a specific port say port 3306 so that a telnet request from a remote machiene can be accepted 4) Disable the effect of 3 above in case I want to Thanks in anticiaption of your kind responses to the questions