[ubuntu] How to turn on another computer on the network

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http://ubuntuforums.org – Hello people, i have something in mind that i want to share with you and hopefully get some new opinions.. I would like to check if nmap -sP tells that the ip of the pc is there or not. WIth crontab, at a specific time, ask the server to send a command to turn on this another linux station. Would you know how ? thanks (Hardware)