内存磁盘告警练习

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#!/usr/bin/bash mem_used=`free -m | grep '^Mem:' | awk '{print $3}'` mem_total=`free -m | grep '^Mem:' | awk '{print $2}'`  #free -m 以MB显示 mem_percent=$((mem_used*100/mem_total)) war_file=$(pwd)/mem_war.txt   if [ $mem_percent -ge 80 ]; then         echo "`date +%F-%H` memory:${mem_percent}%" > $war_file fi   if [ -f $war_file ];then         mail -s "mem war....." solider < $war_file         rm -rf $war_file fi