测试 192.168.4.0/24 整个网段中哪些主机处于开机状态,哪些主机处于关机 (for )
#!/bin/bash
for  i  in   {1..254}
do
          ping ‐c2 ‐i0.3 ‐W1 192.168.4.$i  &>/dev/null
         if  [ $? –eq 0 ];then
               echo "192.168.4.$i is up"
         else
               echo  "192.168.4.$i is down"
         fi
done
测试 192.168.4.0/24 整个网段中哪些主机处于开机状态,哪些主机处于关机 (while )
#!/bin/bash
i=1
while  [  $i  ‐le  254 ]
do
          ping ‐c2 ‐i0.3 ‐W1 192.168.4.$i  &>/dev/null
         if  [ $? –eq 0 ];then
               echo "192.168.4.$i is up"
         else
               echo  "192.168.4.$i is down"
         fi
         let i++
done
测试 192.168.4.0/24 整个网段中哪些主机处于开机状态,哪些主机处于关机 (多进程)
#!/bin/bash
#定义一个函数,ping 某一台主机,并检测主机的存活状态
myping(){
ping ‐c2 ‐i0.3 ‐W1 $1  &>/dev/null
if  [ $? ‐eq 0 ];then
     echo "$1 is up" 
     else
     echo    "$1 is down" 
     fi
}
for  i  in   {1..254}
do
         myping 192.168.4.$i &
done
#使用&符号,将执行的函数放入后台执行
#这样做的好处是不需要等待 ping 第一台主机的回应,就可以继续并发 ping 第二台主机,依次类推。
####进度条
#!/bin/bash
jindu(){
while :
do
     echo  ‐n  '#'
     sleep 0.2
done
}
jindu &
cp  ‐a  $1  $2
killall  $!
echo  "拷贝完成''
红色进度条
#!/bin/bash
declare -a ary
for i in `seq 0 20`
do
    ary[$i]=" "
    echo -en "\e[41;5m ${ary[@]}\e[;0m"
    sleep 1
done
####进度条,动态时针版本
#!/bin/bash
#定义一个显示进度的函数,屏幕快速显示|  / ‐ \
rotate_line(){
INTERVAL=0.1                 #设置间隔时间
COUNT="0"                   #设置 4 个形状的编号,默认编号为 0(不代表任何图像)
while :
do
COUNT=`expr $COUNT + 1`          #执行循环,COUNT 每次循环加 1,(分别代表 4 中不同的形状)
case $COUNT in                     #判断 COUNT 的值,值不一样显示的形状就不一样
"1")                                 #值为 1 显示‐ 
          echo ‐e '‐'"\b\c"                     
          sleep $INTERVAL
          ;;
    "2")                               #值为 2 显示\\,第一个\是转义
          echo ‐e '\\'"\b\c"
          sleep $INTERVAL
          ;;
    "3")                              #值为 3 显示|
          echo ‐e "|\b\c"
          sleep $INTERVAL
          ;;
   "4")                             #值为 4 显示/
          echo ‐e "/\b\c"
          sleep $INTERVAL
          ;;
    *)                                #值为其他时,将 COUNT 重置为 0
          COUNT="0";;
    esac
done
}
rotate_line
####使用死循环实时显示 eth0 网卡发送的数据包流量
#!/bin/bash
while :
do
          echo  '本地网卡 eth0 流量信息如下: '
          ifconfig  eth0   |  grep "RX pack"  | awk  '{print $5}'
          ifconfig  eth0   |  grep "TX pack"  | awk  '{print $5}'
          sleep 1
done
使用 user.txt 文件中的人员名单,在计算机中自动创建对应的账户并配置初始密码
#!/bin/bash
#本脚本执行,需要提前准备一个 user.txt 文件,该文件中包含有若干用户名信息
for  i  in  `cat  user.txt`
do
         useradd  $i
         echo "123456" | passwd ‐‐stdin $i
done
####编写批量修改扩展名脚本,如批量将 txt 文件修改为 doc 文件
#!/bin/bash
#执行脚本时,需要给脚本添加位置参数
#脚本名  txt   doc(可以将 txt 的扩展名修改为 doc) #脚本名  doc  jpg(可以将 doc 的扩展名修改为 jpg)
for  i   in   "ls *.$1"
do
        mv  $i    ${i%.*}.$2
done
####使用 expect 工具自动交互密码远程其他主机安装 httpd 软件
#!/bin/bash
#删除~/.ssh/known_hosts 后,ssh 远程任何主机都会询问是否确认要连接该主机
rm  ‐rf  ~/.ssh/known_hosts
expect  <<EOF
spawn  ssh   192.168.4.254
expect  "yes/no"       {send  "yes\r"}
#根据自己的实际情况将密码修改为真实的密码字串
expect  "password"    {send  "密码\r"}
expect  "#"            {send  "yum ‐y install httpd\r"}
expect  "#"            {send  "exit\r"}
EOF
轮询检测Apache状态并启用钉钉报警
#!/bin/bash
shell_user="root"
shell_domain="apache"
shell_list="/root/ip_list"
shell_row=`cat $shell_list |wc -l`
function trans_text(){
text=$1
curl 'https://oapi.dingtalk.com/robot/send?access_token=b4fcf5862088a1bc7f2bf66a' -H'Content-Type: application/json' -d'{      #指定钉钉机器人hook地址
            "msgtype": "text", 
            "text": {
            "content": "'"$text"'"
        }, 
}'
}
function apache_check_80(){
    ip=$1
    URL="http://$ip/index.html"
    HTTP_CODE=`curl -o /dev/null -s -w "%{http_code}" "${URL}"`
    if [ $HTTP_CODE != 200 ]
        then
            trans_text "
            =================================================================
                                \n $ip Apache 服务器状态异常,网页返回码: '"$HTTP_CODE"' 请及时处理 ! \n
                                ================================================================= \n"
    fi
}
while true
do
shell_list="/root/ip_list"
shell_row=`cat $shell_list |wc -l`
    for temp in `seq 1 $shell_row`
    do
            Ip_Addr=`cat $shell_list |head -n $temp |tail -n 1`
        apache_check_80 $Ip_Addr
    done
    sleep 10
done
一台监控主机,一台被监控主机。被监控主机分区使用率大于80%,就发告警邮件。放到crontab里面,每10分钟执行一次
#!/bin/bash
FSMAX="80"     
remote_user='root'  
remote_ip=(IP地址列表)  
ip_num='0'      
while [ "$ip_num" -le "$(expr ${#remote_ip[@]} -l)"]  
do  
read_num='1'           
        ssh "$remote_user"@"${remote_ip[$ip_num]}"  df -h > /tmp/diskcheck_tmp
        grep '^/dev/*'  /tmp/diskcheck_tmp | awk '{print $5}'|sed 's/\%//g'  > /tmp/diskcheck_num_tmp
        while [ "$read_num" -le $(wc -l < /tmp/diskcheck_num_tmp) ]  
        do
                size=$(sed -n "$read_num" 'p'  /tmp/diskcheck_num_tmp)
                if [ "size" -gt "$FSMAX" ]
                then                       
                        $(grep '^/dev/*'  /tmp/diskcheck_tmp |sed -n $read_num'p'  > /tmp/disk_check_mail)
                        $(echo ${remote_ip[$ip_num]}) >> /tmp/disk_check_mail)
                        $(mail  -s "diskcheck_alert"  admin  <  /tmp/disk_check_mail)
                fi                         
                read_num=$(expr  $read_num + 1)
        done               
        ip_num=$(expr  $ip_num + 1)
done
自动ftp上传
#! /bin/bash
ftp -n << END_FTP  
open 192.168.1.22  
user  test testing      //用户名test  密码:testing  
binary  
prompt  off    //关闭提示  
mput   files     //上传files文件  
close  
bye  
END_FTP
mysqlbak.sh备份数据库目录脚本
#!/bin/bash
DAY=`date +%Y%m%d`
SIZE=`du -sh /var/lib/mysql`
echo "Date: $DAY" >> /tmp/dbinfo.txt
echo "Data Size: $SIZE" >> /tmp/dbinfo.txt
cd /opt/dbbak &> /dev/null || mkdir /opt/dbbak
tar zcf /opt/dbbak/mysqlbak-${DAY}.tar.gz /var/lib/mysql /tmp/dbinfo.txt &> /dev/null
rm -f /tmp/dbinfo.txt
crontab-e
55 23 */3 * * /opt/dbbak/dbbak.sh
expect实现远程登陆自动交互
#!/usr/bin/expect -f
set ipaddress [lindex $argv 0]
set passwd [lindex $argv 1]
set timeout 30
spawn ssh-copy-id root@$ipaddress
expect {
"yes/no" { send "yes\r";exp_continue }
"password:" { send "$passwd\r" }
}
#expect "*from*"
#send "mkdir -p ./tmp/testfile\r"
#send "exit\r"
#expect "#" #i# 命令运行完, 你要期待一个结果, 结果就是返回shell提示符了(是# 或者$)
http心跳检测
#!/bin/bash
function MyInstall
{
        if ! rpm -qa |grep -q "^$1"
        then
                yum install $1
                if [ $? -eq 0 ]
                then
                        echo -e "$i install is ok\n"
                else
                        echo -e "$1 install no\n"
                fi
        else
                echo -e "yi an zhuang ! \n"
        fi
}
for ins in mysql php httpd
do
        MyInstall $ins
done
shell实现插入排序
#!/bin/bash
declare -a array
for i in `seq 1 10`
do
    array[$i]=$RANDOM
done
echo -e "Array_1:  ${array[@]}"
for (( x=1;x<=9;x++ ))
do
    for(( y=1;y<=9;y++ ))
    do
        if [ ${array[$y]} -gt ${array[$y+1]} ]
        then
            temp=${array[$y]}
            array[$y]=${array[$y+1]}
            array[$y+1]=$temp
        fi
    done
done
echo -e "Array_2:  ${array[@]}"
bash实现动态进度条
#!/bin/bash
i=0
bar=''
index=0
arr=( "|" "/" "-" "\\" )
while [ $i -le 100 ]
do
    let index=index%4
    printf "[%-100s][%d%%][\e[43;46;1m%c\e[0m]\r" "$bar" "$i" "${arr[$index]}"
    let i++
    let index++
    usleep 30000
    bar+='#'
    clear
done
printf "\n"
根据文件内容创建账号
#!/bin/bash
for Uname in `cat /root/useradd.txt |gawk '{print $1}'`
do
                id $Uname &> /dev/null
                if [ $? -eq 0 ]
                then
                        echo -e "这个账号已存在!来源:微信公众号【网络技术干货圈】"
                        continue
                fi
        for Upasswd in `cat /root/useradd.txt |gawk '{print $2}'`
        do
                useradd $Uname &> /dev/null
                echo "$Upasswd" |passwd --stdin $Uname &> /dev/null
                if [ $? -eq 0 ]
                then
                        echo -e "账号创建成功!"
                else
                        echo -e "创建失败!"
                fi
        done
done
监控主机的磁盘空间,当使用空间超过90%就通过发mail来发警告
#!/bin/bash  
#monitor available disk space  
#提取本服务器的IP地址信息    
IP=`ifconfig eth0 | grep "inet addr" | cut -f 2 -d ":" | cut -f 1 -d " "`      
SPACE=` df -hP | awk '{print int($5)}'`  
if [ $SPACE -ge 90 ]  
then  
  echo "$IP 服务器 磁盘空间 使用率已经超过90%,请及时处理。"|mail -s "$IP 服务器硬盘告警,
  公众号:Geek安全"   fty89@163.com  
fi
监控服务器网卡流量
#!/bin/bash
#network
#Mike.Xu
while : ; do
speedtime='date +%m"-"%d" "%k":"%M'
speedday='date +%m"-"%d'
speedrx_before='ifconfig eth0|sed -n "8"p|awk '{print $2}'|cut -c7-'
speedtx_before='ifconfig eth0|sed -n "8"p|awk '{print $6}'|cut -c7-'
sleep 2
speedrx_after='ifconfig eth0|sed -n "8"p|awk '{print $2}'|cut -c7-'
speedtx_after='ifconfig eth0|sed -n "8"p|awk '{print $6}'|cut -c7-'
speedrx_result=$[(speedrx_after-speedrx_before)/256]
speedtx_result=$[(speedtx_after-speedtx_before)/256]
echo"$speedday$speedtime Now_In_Speed: "$speedrx_result"kbps Now_OUt_Speed: "$speedtx_result"kbps"
sleep 2
done
检测CPU剩余百分比
#!/bin/bash
#Inspect CPU
#Sun Jul 31 17:25:41 CST 2016
PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/wl/bin
export PATH
TERM=linux
export TERM
CpuResult=$(top -bn 1 | grep "Cpu" | awk '{print $5}' | sed 's/\..*$//g')
if [[ $CpuResult < 20 ]];then
  echo "CPU WARNING : $CpuResult" > /service/script/.cpu_in.txt
  top -bn 1 >> /service/script./cpu_in.txt
  mail -s "Inspcet CPU" wl < /service/script/.cpu_in.txt
fi
检测磁盘剩余空间
#!/bin/bash
#Insepct Harddisk , If the remaining space is more than 80%, the message is sent to the wl
#Tue Aug  2 09:45:56 CST 2016
PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/wl/bin
export PATH
for RemainingSpace in $(df -h | awk '{print $5}' | grep -v 'Use' | sed -e 's/[%]//g')
do
  if [[ $RemainingSpace > 80 ]];then
    echo -e "$RemainingSpace"
    echo -e "$(df -h | grep $RemainingSpace)" > /service/script/.HarddiskWarning
    mail -s "disk Warning" wl < /service/script/.HarddiskWarning
  fi
done
判断哪些用户登陆了系统
#!/bin/bash
declare -i count=0
while true;do
        if who |grep -q -E "^wang"
        then
                echo -e "用户wang 登陆了系统\n 这是第$count 次!威信公众浩:wljsghq"
                break
        else
                let count++
        fi
        sleep 3
done
~    
示例:找出UID为偶数的所有用户,显示其用户名和ID号;
#!/bin/bash
while read line; do
    userid=$(echo $line | cut -d: -f3)
    if [ $[$userid%2] -eq 0 ]; then
echo $line | cut -d: -f1,3
    fi
done < /etc/passwd
批量扫面存活
#!/bin/bash
#By:lyshark
#nmap 192.168.22.0/24>ip
MAC=`cat ip |awk '$1 == "MAC" && $NF == "(VMware)"{print $3}'`
for i in `seq 1 20`
do
temp=`echo ${MAC[@]} |awk '{print $i}'`
IP=`cat /ip |grep  -B5 $temp |grep "Nmap scan"|awk '{print $5}'`
    echo $IP |awk '{print $1}'
done
正则匹配IP
^[0-9]{0,2}|^1[0-9]{0,2}|^2[0-5]{0,2}
 egrep "(^[0-9]{1,2}|^1[0-9]{0,2}|^2[0-5]{0,2})\.([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})\.([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})\.([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})$"
([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})
([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})
([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})
([0-9]{1,2}|1[0-9]{0,2}|2[0-5]{0,2})
egrep "((25[0-5]|2[0-4][0-9]|((1[0-9]{2})|([1-9]?[0-9])))\.){3}(25[0-5]|2[0-4][0-9]|((1[0-9]{2})|([1-9]?[0-9])))"
ls |egrep "((25[0-5]|2[0-4][0-9]|((1[0-9]{2})|([1-9]?[0-9])))\.){3}(25[0-5]|2[0-4][0-9]|((1[0-9]{2})|([1-9]?[0-9])$))"
正则匹配邮箱
egrep "^[0-9a-zA-Z][0-9a-zA-Z_]{1,16}[0-9a-zA-Z]\@[0-9a-zA-Z-]*([0-9a-zA-Z])?\.(com|com.cn|net|org|cn)$" rui
ls |egrep "^(([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-4])$"
