Easy to use shell scripts

1, monitor CPU utilization (by vmstat tool)

#!/bin/bash
#====================================================
# Author: lizhenliang - EMail:[email protected]
# Create Date: 2015-02-01
# Description: cpu utilization monitor
# blog:lizhenliang.blog.51cto.com
#====================================================
if [ `uname` != "Linux" ];then
        echo "check os not linux."
        exit 1
fi
which vmstat &>/dev/null
if [ $? -ne 0 ];then
        echo "vmstat command no found, please install procps package." 
        exit 1
fi
##################################################
cpu_us=`vmstat | awk '{print $13}' | sed -n '$p'`
cpu_sy=`vmstat | awk '{print $14}' | sed -n '$p'`
cpu_id=`vmstat | awk '{print $15}' | sed -n '$p'`
cpu_wa=`vmstat | awk '{print $16}' | sed -n '$p'`   #等待I/0完成
cpu_sum=$(($cpu_us+$cpu_sy))
cpu_info()
{
echo "CPU_Sum : $cpu_sum% ( CPU_Use:${cpu_us}% , CPU_System:${cpu_sy}% )" 
echo "CPU_Idle : ${cpu_id}%"
echo "CPU_Wait : ${cpu_wa}"
}
#cpu_info;
if [ $cpu_sum -ge 90 ];then
        echo "CPU utilization $cpu_sum." | mail -s "CPU Monitor" [email protected]
fi

2, monitor memory usage

#!/bin/bash
#====================================================
# Author: lizhenliang - EMail:[email protected]
# Create Date: 2015-02-01
# Description: memory utilization monitor
# blog:lizhenliang.blog.51cto.com
#====================================================
which bc &>/dev/null
if [ $? -ne 0 ];then
        echo "bc command no found, Please install bc package." 
        exit 1
fi
Date=`date +%F" "%H:%M`
IP=`ifconfig eth0 | awk '/inet addr/ {print $2}' | cut -d: -f2`
Total=`free -m | grep Mem | awk '{print $2}'`
Use=`free -m | awk '/buffers\// {print $NF}'`
Free=$(($Total-$Use))
Total_conv=`echo "scale=2;$Total/1024" | bc | awk '{print $1"G"}'`  #通过bc计算，保留小数点后两位（scale）
if [ $Free -lt 200 ];then
        Content=`echo -e "Date : $Date \nHost : $IP \nTotal : ${Total_conv} \nUse : ${Use}M \nFree : ${Free}M"`
        echo "$Content" | mail -s "Memory Monitor" [email protected]
fi

3, disk utilization monitoring

#!/bin/bash
#====================================================
# Author: lizhenliang - EMail:[email protected]
# Create Date: 2015-02-01
# Description: disk utilization monitor
# blog:lizhenliang.blog.51cto.com
#====================================================
Date=`date +%F" "%H:%M`
IP=`ifconfig eth0 | awk '/inet addr/ {print $2}' | cut -d: -f2`
Total=`fdisk -l | grep "Disk /dev/sd[a-z]" |awk '{print $2$3"GB"}' |sed 's/:/=/' |xargs echo -n |sed 's/[ ]/,/g'`    #去掉换行符，并以逗号分隔在邮件显示总每个分区大小
Disk_Use=`df -h |awk '{print $1"="$5}' | sed '1d' | sed 's/%//g'`
for i in $Disk_Use
do
        A=`echo $i |awk -F'=' '{print $2}'`
        if [ $A -gt 8 ];then
                echo -e "Date : $Date \nHost : $IP \nTotal : $Total \nProblem : Part Use ${i}%" | mail -s "Disk Mo
nitor" [email protected]
        fi
done