kill 与 cat一起使用，干掉某个进程 (kill a process by its pid file)
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refer to : http://mindspill.net/computing/linux-notes/kill-a-process-from-pid-file/
kill -9 $(cat tmp/pids/mongrel.pid)
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refer to : http://mindspill.net/computing/linux-notes/kill-a-process-from-pid-file/
kill -9 $(cat tmp/pids/mongrel.pid)