shell监控cpu的使用率是否超过90%

用shell判断cpu的使用率是否超过98%，如果超过90%获取cpu使用率最高的进程信息，如果不超过输出cpu使用率前十的进程信息

/mnt/zzy/data/scripts/cpumonitor.sh

#!/bin/bash
# 获取CPU使用率（注意这里用了top命令）
#logfile=/root/syszzy.log
logfile=/mnt/zzy/syszzy.log
cpu_usage=$(top -b -n1 | grep "Cpu(s)" | awk '{print $2}' | cut -d'.' -f1)
if [ "$cpu_usage" -gt 98 ]; then
    # 如果超过98%，获取CPU使用率最高的进程信息
    top_processes=$(top -b -n1 | tail -n +8 | sort -k9rn | head)
    echo "CPU usage is over 98%, top processes:" >> $logfile
    echo "---------------------`date`-----------------" >> $logfile
    echo "$top_processes" >> $logfile
elif [ "$cpu_usage" -gt 90 ]; then
    # 如果超过90%但不到98%，输出CPU使用率前十的进程信息
    top_processes=$(top -b -n1 | tail -n +8 | sort -k9rn | head)
    echo "CPU usage is over 90%, top processes:" >> $logfile
    echo "---------------------`date`-----------------" >> $logfile
    echo "$top_processes" >> $logfile
#else
    # 如果不超过90%，输出CPU使用率前十的进程信息
   # top_processes=$(top -b -n1 | tail -n +8 | sort -k9rn | head )
    #echo "CPU usage is below 90%, top processes:" >> $logfile
    #echo "---------------------`date`-----------------" >> $logfile
    #echo "$top_processes" >> /root/syszzy.log
fi

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