其实ps这个命令在监控中起着不可缺少的作用：
ps axjf 树装显示进程
ps -eLf|head 1
UID PID PPID LWP C NLWP STIME TTY TIME CMD
注意上面的NLWP，就是线程数，而LWP就是线程ID。
所以如果要统计系统中某个JAVA进程的线程数，命令就是：
ps -eLf|grep java|wc -l
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Hi, Thanks for article. Everytime like to read you.
Thanks