shell脚本一一项目4

主题：一键查看服务器使用率

cpu vmstat  suyu wa 

memery free

disk  df -h  /dev

tcp连接数 netstat 

cpu(){
used=$(vmstat |awk '{if(NR==3)print $13+$14}') iowait=$(vmstat |awk '{if(NR==3)print $16}') echo "cpu - used :${used}%, iowait : ${iowait}%"
}

memery(){
total=$(free -m|awk '{if(NR==2)printf "%.1f",$2/1024}') used=$(free -m|awk '{if(NR==2)printf "%.1f",$3/1024}') available=$(free -m|awk '{if(NR==2)printf "%.1f",$NF/1024}') echo "memery - total:${total}G,used: ${used}G,${available}G"

}

disk(){
fs=$(df -h|awk '/^\/dev/{print $1}') for p in$fs;do
mounted=$(df -h|awk -v p=$p '$1==p{print $NF}') used=$(df -h|awk -v p=$p '$1==p{print $3}') size=$(df -h|awk -v p=$p '$1==p{print $2}') echo "disk - mounted:$mounted, size: $size, used:$used"
done
}

tcp_status(){

summary=$(netstat -anplt|awk '{a[$6]++}END{for (i in a)printf i ":"a[i]" "}') echo "tcp link -$summary"
}

 

小结：

1.printf "%.1f",$x 打印小数点后1位

2.awk的用法

3.cpu 用户和内核态（us sy）的使用率不超过60% iowait(wa)不超过10%