# free -m |awk 'NR==3 {print $NF}'
4012
#!/bin/bash 脚本
used_mem=`free -m |awk 'NR==3 {print$NF}'`
if [ $used_mem -lt 5000]
then
echo"mem is not enough,$used_mem."
echo"mem is not enough,$used_mem."|mail -s "mem warning $(data +%F)"[email protected] #发邮件
fi