第一步：编写shell脚本
vim check.sh
脚本内容如下
#!/bin/bash
#这个脚本使用来统计CPU、磁盘、内存使用率、带宽的
total=0
system=0
user=0
i=0
#带宽使用情况
time=`date "+%Y-%m-%d %k:%M"`
day=`date "+%Y-%m-%d"`
minute=`date "+%k:%M"`
echo "*************************************************************************" >> 123.txt
echo "统计开始时间：$day $minute" >> 123.txt
#循环五次，避免看到的是偶然的数据
echo "#带宽的使用情况：#" >>123.txt
while (( $i<5 ))
do
#原先的`ifconfig eth0|sed -n "7p"|awk '{print $2}'|cut -c7-`方式获取网卡的信息为空，已经注释掉
#rx_before=`ifconfig eth0|sed -n "7p"|awk '{print $2}'|cut -c7-`
#tx_before=`ifconfig eth0|sed -n "7p"|awk '{print $6}'|cut -c7-`
rx_before=$(cat /proc/net/dev | grep 'eth' | tr : " " | awk '{print $2}')
tx_before=$(cat /proc/net/dev | grep 'eth' | tr : " " | awk '{print $10}')
sleep 2
#rx_after=`ifconfig eth0|sed -n "7p"|awk '{print $2}'|cut -c7-`
#tx_after=`ifconfig eth0|sed -n "7p"|awk '{print $6}'|cut -c7-`
rx_after=$(cat /proc/net/dev | grep 'eth' | tr : " " | awk '{print $2}')
tx_after=$(cat /proc/net/dev | grep 'eth' | tr : " " | awk '{print $10}')
rx_result=$[(rx_after-rx_before)/1024/1024/2*8]
tx_result=$[(tx_after-tx_before)/1024/1024/2*8]
echo "$time Now_In_Speed: $rx_result Mbps Now_OUt_Speed: $tx_result Mbps" >>123.txt
let "i++"
done
rx_result=$(cat 123.txt|grep "$time"|awk '{In+=$4}END{print In}')
tx_result=$(cat 123.txt|grep "$time"|awk '{Out+=$7}END{print Out}')
In_Speed=$(echo "scale=2;$rx_result/5"|bc)
Out_Speed=$(echo "scale=2;$tx_result/5"|bc)
#echo "#带宽的5次的平均值是：#" >>123.txt
echo "$time In_Speed_average: $In_Speed Mbps Out_Speed_average: $Out_Speed Mbps" >>123.txt
#CPU使用情况
which sar > /dev/null 2>&1
if [ $? -ne 0 ]
then
total=`vmstat 1 5|awk '{x+=$13;y+=$14}END{print x+y}'`
average=$(echo "scale=2;$total/5"|bc)
fi
echo "#CPU使用率:#" >>123.txt
echo "Total CPU is already use: $average%" >>123.txt
#磁盘使用情况(注意：需要用sed先进行格式化才能进行累加处理)
disk_used=$(df -m | sed '1d;/ /!N;s/\n//;s/ \+/ /;' | awk '{used+=$3} END{print used}')
disk_totalSpace=$(df -m | sed '1d;/ /!N;s/\n//;s/ \+/ /;' | awk '{totalSpace+=$2} END{print totalSpace}')
disk_all=$(echo "scale=4;$disk_used/$disk_totalSpace" | bc)
disk_percent1=$(echo $disk_all | cut -c 2-3)
disk_percent2=$(echo $disk_all | cut -c 4-5)
disk_warning=`df -m | sed '1d;/ /!N;s/\n//;s/ \+/ /;' | awk '{if ($5>85) print $5 $6;} '`
echo "#磁盘利用率#" >>123.txt
echo "hard disk has used: $disk_percent1.$disk_percent2%" >>123.txt
echo -e "\t\t#磁盘存在目录使用率超过85%报警#" >>123.txt
echo -e "\t\tover used: $disk_warning" >>123.txt
#内存使用情况
memery_used=$(free -m | awk 'NR==2' | awk '{print $3}')
buffer_used=$(free -m | awk 'NR==2' | awk '{print $6}')
cache_used=$(free -m | awk 'NR==2' | awk '{print $7}')
free=$(free -m | awk 'NR==2' | awk '{printf $4}')
memery_all=$(free -m | awk 'NR==2' | awk '{print $2}')
used_all=$[memery_all-(free+buffer_used+cache_used)]
echo "$used_all $memery_all $free" >>123.txt
memery_percent=$(echo "scale=4;$memery_used / $memery_all" | bc)
memery_percent2=$(echo "scale=4; $used_all / $memery_all" | bc)
percent_part1=$(echo $memery_percent | cut -c 2-3)
percent_part2=$(echo $memery_percent | cut -c 4-5)
percent_part11=$(echo $memery_percent2 | cut -c 2-3)
percent_part22=$(echo $memery_percent2 | cut -c 4-5)
echo "#内存使用率#" >> 123.txt
echo "system memery is already use: $percent_part1.$percent_part2%" >>123.txt
echo "actual memery is already use: $percent_part11.$percent_part22%" >>123.txt
echo "结束本次统计：$day $minute" >> 123.txt
echo "*************************************************************************" >> 123.txt
echo -e "\n\n\n\n" >> 123.txt
第二步：创建shell脚本中用到的文件123.txt
touch 123.txt
第三步：给check.sh和123.txt授予所有权限
chmod 777 check.sh
chmod 777 123.txt
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第四步：执行check.sh脚本
./check.sh
第五步：查看执行写入文件的情况
tail -30 123.txt
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