[系统运维][shell脚本] 计算内存使用率占比

[root@shell jao]# cat meminfo.sh 
#!/bin/bash

# free参数详解: total(总量),free(未使用),buff/cache(缓存),shared(共享内存),swap(交换分区) 
# buff和cache区别？
# buff  做块设备的缓冲大小
# cache 用来做文件的缓冲 


MEM_TOTAL=`free -h |awk 'NR==2{print $2}'`

MEM_USE=`free -h |awk 'NR==2{print $3}'`
MEM_USED=`free | grep -i mem |awk '{print $3/$2*100"%"}'`

MEM_FREE=`free -h |awk 'NR==2{print $4}'`
MEM_FREED=`free | grep -i mem |awk '{print $4/$2*100"%"}'`

MEM_BUFF_CACHE=`free -h |awk 'NR==2{print $6}'`
MEM_BUFF_CACHED=`free | grep -i mem |awk '{print $6/$2*100 "%"}'`

MEM_SHARE=`free -h |awk 'NR==2{print $5}'`
MEM_SHARED=`free | grep -i mem |awk '{print $5/$2*100 "%"}'`
MEM_ZONE=`head -3 /proc/meminfo | awk 'NR==1{t=$2}NR==2{f=$2;print(t-f)*100/t"%"}'`


echo -e "\t\e[1;32m内存总量: $MEM_TOTAL \e[0m" 
echo -e "\t\e[1;32m内存总量减剩余内存(所有已使用)占比: $MEM_ZONE \e[0m"
echo -e "\t\e[1;32m已使用: $MEM_USE  占比: $MEM_USED \e[0m"
echo -e "\t\e[1;32m剩  余: $MEM_FREE  占比: $MEM_FREED \e[0m"
echo -e "\t\e[1;32m共  享: $MEM_SHARE  占比: $MEM_SHARED \e[0m"
echo -e "\t\e[1;32m缓冲区: $MEM_BUFF_CACHE  占比: $MEM_BUFF_CACHED \e[0m"