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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 atelnet request from a remote machiene ..

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i did thisfrom the console crontab -ethen i inserted this in my vi editor 10 * * * *curl http://mysite.com/test.phpthen i exited vithen i did crontab -land the cron job was listedthen i did /sbin/service crond startand i waited for 10 mins to get a mess..

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