ps -ef命令的部分输出如下所示：
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 2012 ? 00:00:01 init [3]
root 2 1 0 2012 ? 00:00:01 [migration/0]
root 3 1 0 2012 ? 00:00:00 [ksoftirqd/0]
root 4 1 0 2012 ? 00:00:00 [watchdog/0]
root 5 1 0 2012 ? 00:00:00 [events/0]
root 6 1 0 2012 ? 00:00:00 [khelper]
root 7 1 0 2012 ? 00:00:00 [kthread]
root 9 7 0 2012 ? 00:00:00 [xenwatch]
root 10 7 0 …