These 28 shell scripts worth collecting will allow you to fish for nearly 7 hours a day!

Foreword:

In daily work, whenever you want to deal with the server, the artifact that must be inseparable is the shell script. The shell script can greatly improve the work efficiency of the engineer and avoid some mistakes caused by some factors. So today, I will share 28 shell scripts with you in the circle. I hope it will be helpful to you. The scripts are more and longer. If you can't remember for a while, you can save them first, and compare them when you use them!

1. Polling to detect Apache status and enable

#!/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

2. One monitoring host and one monitored host. If the partition usage rate of the monitored host is greater than 80%, an alert email will be sent. crontab and execute 160f836819082e every 10 minutes

#！/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

3. Monitor the disk space of the host. When the used space exceeds 90%, send a warning by email

#!/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"   [e-mail]  
fi

4. Automatic FTP upload

#! /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

5.mysqlbak.sh backup database directory script

#!/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

6. Print rainbow

declare -a ary


for i in `seq 40 49`
do

    ary[$i]=" "
    echo -en "\e[$i;5m ${ary[@]}\e[;0m"
    
done


declare -a ary
for s in `seq 1 10000`
do
    for i in `seq 40 49`
    do
        ary[$i]=" "
        echo -en "\e[$i;5m ${ary[@]}\e[;0m"    
    done
done

7. Printing diamond

#!/bin/bash

for (( i = 1; i < 12; i++))
do
    if [[ $i -le 6 ]]
    then
        for ((j = $((12-i)); j > i; j--))
        do
            echo -n " "
        done

        for ((m = 1; m <= $((2*i-1)); m++))
        do
             echo -n "* "
        done
            echo ""
#*****************************************************************************
    elif [[ $i -gt 6 ]]
    then
        n=$((12-i))
        for ((j = $((12-n)); j > n; j--))
        do
            echo -n " "
        done

        for ((m = 1; m <= $((2*n-1)); m++))
        do
                        echo -n "* "
        done
            echo ""
    fi

done

8.expect to realize the automatic interaction of remote login

#!/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$)

9. http heartbeat detection

#!/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 implements insertion sort

#!/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[@]}"

13.bash realizes dynamic progress bar

#!/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"

based on the content of the file

#!/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

15. Red progress bar

#!/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

16. Monitor server network card traffic

#!/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

17. Check the remaining percentage of CPU

#!/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

18. Detect remaining disk space

#!/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

19. bash-Realize detection of apache status and nail alarm

#!/bin/bash


function trans_text(){
    text=$1
curl 'https://oapi.dingtalk.com/robot/send?access_token=b4fcf5862088a1bc7f2bf66aea051869e62ff5879fa0e0fddb0db9b1494781c2' -H'Content-Type: application/json' -d'
{
    "msgtype": "text", 
    "text": {
        "content": "'"$text"'"
    }, 
}'
}


function desk_check(){
    
    dftype=$1
    shell_row=`df |wc -l`

for i in `seq 2 $shell_row`
do

    temp=(`df -h |head -n $i |tail -n 1 |awk '{print $5 "\t" $6}'`)
    disk="`echo ${temp[0]} |cut -d "%" -f 1`"
    name="${temp[1]}"
    hostname=`hostname`
    IP=`ifconfig |grep -v "127.0.0.1" |grep "inet addr:" |sed 's/^.*inet addr://g'|sed 's/ Bcas..*$//g'`
    #echo -e "$disk     $name"
    Dat=`date "+%F %T"`
    
    if [ $disk -ge $dftype ]
    then
        echo  "
                            ======================== \n
                    >磁盘分区异常< \n
               主机名: $hostname \n        
               IP地址: $IP \n
                分区名: $name \n
               使用率: $disk %\n 
               发生时间: $Dat \n
                          ========================= \n"
    fi
done
}

function apache_check(){
    url=$1
URL="http://$url/"
HTTP_CODE=`curl -o /dev/null -s -w "%{http_code}" "${URL}"`

if [ $HTTP_CODE != 200 ]
    then
        echo  "
                           ======================== \n
                   >Apache服务异常<
                           主机名: $hostname \n         
                           IP地址: $IP \n
                           返回代码: $HTTP_CODE \n
                           发生时间: $Dat \n
                          ========================= \n"                        
fi
}

while true
do
    desk_check 10
    apache_check 127.0.0.1

    sleep 10
done

20. Memory detection

#!/bin/bash

#Inspect Memory : If the memory is less than 500 , then send mail to wl

#Tue Aug  2 09:13:43 CST 2016


PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/wl/bin

export PATH


MEM=$(free -m | grep "Mem" | awk '{print $4}')

if [[ MEM < 500 ]];then
  echo -e "Memory Warning : Memory free $MEM" > /service/script/.MemoryWarning
  mail -s "Memory Warning" wl < /service/script/.MemoryWarning
fi

21. Remaining inode detection

#!/bin/bash

#Inspcet Inode : If the free INODE is less than 200, the message is sent to the wl

#Tue Aug  2 10:21:29 CST 2016

PATH=/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/wl/bin

export PATH

for FreeInode in $(df -i | grep -v "Filesystem" | awk '{print $4}')
do
  if [[ $FreeInode < 200 ]];then
    echo -e "$(df -i | grep "$FreeInode")" > /service/script/.FreeInode
    mail -s "FreeInode Warning" wl < /service/script/.FreeInode
  fi
done

22. Determine which users have logged in to the system

#!/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

23. Create accounts in batch

#!/bin/bash

sum=1

while [ $sum -le 30 ]
do
    if [ $sum -le 9 ]
    then
        user="user_0$sum"
    else
        user="user_$sum"
    fi

        useradd $user
        echo "123456" |passwd --stdin $user
        chage -d 0 $user
        let sum=sum+1

done

24. Batch scan surface survival

#!/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

25. Regular match 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])$))"

26. Regular matching mailbox

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])$"

27. Realize the cloth effect

#!/bin/bash


function ary_go
{
    $1 $2
    
    for (( i=0;i<=$1;i++ ))
    do
        for (( s=0;s<=$2;s++ ))
        do
            if [ $[$i%2] == 0 ]
            then
        
                if [ $[$s%2] == 0 ]
                then
                    echo -en "  "
                else
                    echo -en "\e[;44m  \e[;m"
                fi
            else
                                                if [ $[$s%2] == 0 ]
                                then
                                        echo -en "\e[;42m  \e[;m"
                                else
                                        echo -en "  "
                                fi



            fi

        done
            echo 

    done

}


ary_go 25 50

28. Eliminate users

#!/bin/bash
w | awk 'NR>=3 {printf $1 "\t" $2 "\t" $3 "\n"}' > /tmp/who.txt
for i in $(awk '{printf $1}' /tmp/bai.txt)
do
        k=$(egrep -v "$i" /tmp/who.txt | awk '{printf $2} "\n"' | awk '{printf $2 "\n"}')
        for j in $k
        do
                pkill -9 -t "$j"
        done
done

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