Linux平台下，尤其是没有图形界面的情况下，要对系统状态进行监控是比较麻烦的。下面是来自51cto一个系统监控的脚本，转载分享：
#!/bin/sh
#systemstat.sh
#Mike.Xu
IP=192.168.1.227
top -n 2| grep "Cpu" >>./temp/cpu.txt
free -m | grep "Mem" >> ./temp/mem.txt
df -k | grep "sda1" >> ./temp/drive_sda1.txt
#df -k | grep sda2 >> ./temp/drive_sda2.txt
df -k | grep "/mnt/storage_0" >> ./temp/mnt_storage_0.txt
df -k | grep "/mnt/storage_pic" >> ./temp/mnt_storage_pic.txt
time=`date +%m"."%d" "%k":"%M`
connect=`netstat -na | grep "219.238.148.30:80" | wc -l`
echo "$time $connect" >> ./temp/connect_count.txt
貌似监控CPU、内存、硬盘、目录、网络连接数等，并将其记录到文件里面。现在还不是很懂，等后面懂了再来慢慢分析。
下面这个脚本只监控磁盘空间，当使用空间超过90％就通过发mail来发警告
#!/bin/bash
#monitor available disk space
SPACE='df | sed -n '/ / $ / p' | gawk '{print $5}' | sed 's/%//'
if [ $SPACE -ge 90 ]
then
yourmail@163.com
fi
下面这个脚本，监控CPU和内存的使用情况
#!/bin/bash
#script to capture system statistics
OUTFILE=/home/xu/capstats.csv
DATE='date +%m/%d/%Y'
TIME='date +%k:%m:%s'
TIMEOUT='uptime'
VMOUT='vmstat 1 2'
USERS='echo $TIMEOUT | gawk '{print $4}' '
LOAD='echo $TIMEOUT | gawk '{print $9}' | sed "s/,//' '
FREE='echo $VMOUT | sed -n '/[0-9]/p' | sed -n '2p' | gawk '{print $4} ' '
IDLE='echo $VMOUT | sed -n '/[0-9]/p' | sed -n '2p' |gawk '{print $15}' '
echo "$DATE,$TIME,$USERS,$LOAD,$FREE,$IDLE" >> $OUTFILE