如果CPU占用率持續達到80以上則調用打印java線程占用率堆棧的腳本，見https://github.com/oldratlee/useful-shells/blob/master/show-busy-java-threads.sh，具體用法見他的github wiki！

#!/bin/bash#cpu idle percentcpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."` if [ -d "/opt/scripts/log" ]then  cd /opt/scriptselse  mkdir /opt/scripts/logfi count=0condition=truewhile conditiondo    if [ $cpu_idle -le 20 ]    then      pids=`top -b -d 1 -n 1 | grep java | awk '{if($9 > 80) print $1}'`      for ((a = 1; a < 10; a++))      do       for pid in $pids       doi         #involve jdk existence check later         date=`date +%Y%m%d%H%M`         sh showstack.sh -c 30 -p $pid > log/stack_$pid_$date.log         jstat -gcutil $pid > log/gc_$pid_$date.log       done      done      for pid in $pids      do       date=`date +%Y%m%d%H%M`       jmap -heap $pid > log/heap_$pid_$date.log      done      count++      cpu_idle=`top -b -d 1 -n 2 | grep Cpu | awk 'NR>1{print $5}' | cut -f 1 -d "."`      if [ $count -ge 3]      then       #send emaili       #server ip address       ip=`ifconfig eth0 | grep "inet addr" | cut -f 2 -d ":" | cut -f 1 -d " "`       condition=false       count=0      fi    else      condition=false      count=0    fidone

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