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判断主机存活

v1.0 文件批量扫描

#! /bin/bash

num=0
red="\e[1;31m"
blue="\e[1;34m"
reset="\e[0m"
if [ $# -eq 0 ];then
	echo -e "${red}usage: `basename $0` file$reset"
	exit
fi
if [ ! -f $0 ];then
	echo -e "${red}the file type is not committed$reset"
	exit
fi
for ip in `cat $1`
do
	ping -c1 $ip &>/etc/null
	if [ $? -eq 0 ];then
		echo -e "$blue$ip is up$reset"
		((num++))
	fi
done
if [ $num -eq 0 ];then
	echo -e "${red}all die$reset"
fi

v2.0 24掩码网段扫描

#! /bin/bash

>up_ip.txt
read -p "please input an ip: " ip
net=${ip%.*}
for i in {1..254}
do
	{	
		ip=$net.$i
		ping -c1 -W1 $ip &>/etc/null
		if [ $? -eq 0 ];then
			echo "$ip is up" |tee -a up_ip.txt
		fi
	}&	#后台多进程运行
done
wait	#等待循环执行完毕
echo "results have been pushed into up_ip.txt"

内存使用率

#! /bin/bash

total=`free -m |awk '/Mem/{print $2}'`
used=`free -m |awk '/Mem/{print $3}'`
rate=$((used/total))
echo "当前内存使用:$rate%"

磁盘预警

#! /bin/bash

mail=2104773395@qq.com
disk_used=`df |grep '/$' |awk -F"[ %]+" '{print $(NF-1)}'`
if [ $disk_used -ge 90 ];then
	echo "`date +%F/%H:%M:%S`,disk_used:$disk_used" |mail -s "disk warn!" $mail
fi

配置yum源

#! /bin/bash
#检查网络连通性
ping www.baidu.com &>/etc/null
if [ $? -ne 0 ];then
	ping 114.114.114.114 &>/etc/null
	if [ $? -ne 0 ];then
		echo "please cheak your DNS"
	else
		echo "please cheak your network"
	exit
else
	echo "erro"
	exit
fi
#获取系统版本
os_v=`cat /etc/redhat-release |awk -F"[ .]+" '{print $4}'`
#备份yum源
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
#下载
case $os_v in
7)
	curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
	;;
6)
	curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-6.10.repo --no-check-certificate
	;;
esac
#更新缓存
yum clean all
yum makecache

ssh批量密钥分发

#! /bim/bash

rpm -q expect &>/etx/null
if [ $? -ne 0 ];then
	yum install -y expect
fi

if [ ! -f ~/.ssh/id_rsa ];then
	ssh-keygen -P "" -f ~/.ssh/id_rsa
fi

>push.ip
pw=123123
for i in `seq 254`
do
	{
		ip=192.168.0.$i
		ping -c1 -W1 $ip &>/etc/null
		if [ $? -eq 0 ];then
			expect <<-EOF
			set timeout 10
			spawn ssh-copy-id $ip
			expect {
				"yes/no" {send "yes\r"; exp_continue}
				"password:" {send "$pw\r"};
			}
			expect eof
			EOF
		fi
		echo "$ip is ok" >push.ip
	}&
done
wait
echo "results have been pushed into push.ip"

统计

基本样式

#! /bin/bash

declare -A count

while read line
do
	type=`echo $line |awk '{print $1}'`
	let count[$type]++
done <file

for i in ${!count[@]}
do
	echo "$i: ${count[$i]}"
done

#awk '{count[$1]++} END{for(i in count){print i,count[i]}}' file
#awk '{print $1}' file |sort |uniq -c

访问日志前10

grep '\#16/Jul/2024' log |awk '{req[$1]++}END{for(i in req){print i,req{i}}}' |sort -k2 -nr |head 10