Everlasting ruby process

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http://stackoverflow.com – I ma trying to kill the ruby process, but it is impossible. I am using Ubuntu, I clean my cache, I reboot my os, then the ruby server is running. But if I run pgrep -l ruby, I get some pid I am trying to kill with kill -9 $pid. But when I run again pgrep -l ruby, it everlastingly showing the same process I want to kill... Someone could help ? (HowTos)