Linux運維之shell腳本進階篇

本文轉載自查看原文 2018-08-03 11:02 949 Linux運維

常用腳本for 循環，和nginx的啟動

1）for循環示例

[root@game updata]# cat pvzgame_jar.sh 
#!/bin/bash

SERVERS=(
pvzgame_quick_001
pvzgame_quick_002
)

for var in ${SERVERS[@]} 
do
   mv /opt/htdocs/$var/${var}.jar /opt/htdocs/$var/${var}.jar.bak.2019.5.22
   cp /root/updata/game_pvz_17-39.jar  /opt/htdocs/$var/${var}.jar
   echo "文件更新完成："$var
done

for循環更改文件

2）nginx啟動腳本示例

#!/bin/bash

# [ -e $PID ]   -e 存在
PROCESS=/usr/local/nginx/sbin/nginx  
PID=/var/run/nginx.pid
start(){
    if [ -e $PID ];then   
      echo -e "\033[34m nginx already running... \033[0m"
    else
      $PROCESS
      echo -e "\033[34m ngins start OK \033[0m"
      exit 0
    fi
}

stop(){
  if [ -e $PID ];then
     $PROCESS -s stop
     echo -e "\033[34m nginx stop OK ... \033[0m"
  else
     echo -e "\033[34m nginx not running... \033[0m"
  fi
}


reload(){
  if [ -e $PID ];then
    $PROCESS -s reload
    echo -e "\033[34m nginx is reload ... \033[0m"
  else
    echo -e "\033[31m nginx not running ... \033[0m"
  fi
}

configtest(){
  $PROCESS -t
}

status(){
  if [ -e $PID ];then
     echo -e "\033[34m nginx already running... \033[0m"
  else
     echo -e "\033[31m nginx not running ... \033[0m"
  fi
}

case $1 in
  start)
      start
    ;;

  stop)
    stop
    ;;
  reload)
    reload
    ;;
  configtest)
    configtest
    ;;
  status)
    status
    ;;
  *)
  echo -e $"\033[31m Usage: $prog {start|stop|reload|configtest|status}\033[0m"
  ;;
esac

nginx

一、if語句的使用

1）語法規則

if [條件]
    then
        指令
fi
或
if [條件];then
    指令
fi
提示：分號相當於命令換行，上面兩種語法等同
特殊寫法；if[ -f"$file1" ];then echo 1;fi 相當於[ -f"$file1" ] && echo 1

2）多分支結構語法

多分支結構；語法
if 條件
　　then
　　　　指令集
elif 條件		  #多個
　　then
　　　　指令集
else
　　　　指令集
fi

3）比較大小的案例

案例一，交互式的

#!/bin/sh
read -p "pls input two num:" a b
if [ $a -lt $b ];then
    echo "yes,$a less than $b"
    exit
fi
if [ $a -eq $b ];then
    echo "yes,$a eaual than $b"
    exit
fi
if [ $a -gt $b ];then
    echo "yes,$a greater than $b"
    exit
fi

案例二，命令行輸入比較大小

[root@tomcat day1]# cat ifif.sh 
#!/bin/sh
a=$1
b=$2
[ $# -ne 2 ] && {
　　echo "USAGE:$0 NUM1 NUM2"
　　exit 1
}

expr $a + 0 &>/dev/null
RETVAL1=$?
expr $b + 0 &>/dev/null
RETVAL2=$?

test $RETVAL1 -eq 0 -a $RETVAL2 -eq 0 ||{
　　echo "Pla input two intnum again"
　　exit 2
}

if [ $a -lt $b ]
　　then
　　　　echo "$a < $b"
elif [ $a -eq $b ]
　　then
　　　　echo "$a = $b"
else
　　　　echo "$a > $b"
fi
exit 0

案例三，比較大小經典版

[root@oldboy66 day2]# cat if_else.sh
#!/bin/sh
if [ $1 -eq $2 ]
   then
	echo "$1=$2"
	exit
elif [ $1 -gt $2 ]
   then
        echo "$1>$2"
        exit
else
   echo "$1<$2"
   exit
fi

4）判定在特定目錄下創建文件的案例

[root@oldboy66 day2]# cat if4.sh 
#!/bin/sh
path=/server/scripts
file=if3.sh
if [ ! -d $path ];then
    mkdir -p $path
    echo "$path is not exist,already created it."
fi

if [ ! -f $path/$file ];then
    touch $path/$file
    echo "$path/$file is not exist,already created it."
    exit
fi
echo "ls -l $path/$file"
ls -l $path/$file

5）查看內存，測試郵件報警

1）安裝sendmail郵件工具
yum install sendmail -y
/etc/init.d/sendmail start
2）獲取內存大小
[root@oldboy66 day2]# free -m
             total       used       free     shared    buffers     cached
Mem:           980        906         73          0        135        489
-/+ buffers/cache:        282        698
Swap:          511          0        511
[root@oldboy66 day2]# free -m|grep buffers/
-/+ buffers/cache:        281        698
[root@oldboy66 day2]# free -m|grep buffers/|awk '{print $NF}'
698
3）寫入腳本
[root@oldboy66 day3]# cat check_mem.sh 
#!/bin/sh
used_men=`free -m|awk 'NR==3 {print $NF}'`
if [ $used_men -lt 800 ];then
   echo "men is not enough,$used_men"
   echo "men is not enough.$used_men."|mail -s "men warning $(date +%F)" 1111111111@qq.com
fi
4）qq郵箱設置
打開qq郵箱===》“設置” ====》“反垃圾”=====》
“設置郵件地址白名單”=====》添加“root@tomcat.localdomain”
5）執行腳本，收到郵件
6）寫入定時任務
[root@oldboy66 ~]# crontab -e
###發郵件mail,mutt。Sendmail服務要開啟,定時任務報警
*/3 * * * * /bin/sh /server/scripts/day3/check_mem.sh &>/dev/null

二、檢測mysql服務是否啟動，如果沒啟動，就去啟動

1）檢測思路

netstat -lntup|grep 3306        看端口
ps -ef|grep mysql		看進程
mysql -u root -p123456 -S /data/3307/mysql.sock -e "select version();"	（多實例）登錄進去看版本取返回值
	+-----------+
	| version() |
	+-----------+
	| 5.5.32    |
	+-----------+
mysql -u root -poldboy -S /data/3307/mysql.sock -e "select version();" &>/dev/null
echo $?

2）檢測啟動腳本

方法一;根據端口

mysql單實例檢測端口
[root@tomcat ]# cat port.sh 
#!/bin/sh
port=`netstat -lntup|grep 3306|wc -l`
if [ $port -ne 1 ]
	then
		/etc/init.d/mysqld start
	else
		echo "MySQL is running"
fi

方法二;根據進程

mysql檢測進程
[root@tomcat ]# cat process.sh 
#!/bin/sh
process=`ps -ef|grep mysql|grep -v grep|wc -l`
if [ $process -ne 2 ]
	then
		/etc/init.d/mysqld start
	else
		echo "MySQL is running"
fi
### sh -x process.sh  	#注意事項 調試。使用進程腳本不要用到mysql的名字

三、檢查web服務是否啟動

1）簡單的檢查web是否啟動

[root@linux day3]# cat check_web.sh 
#!/bin/sh
http_code=`curl -I -s -w "%{http_code}" -o /dev/null 192.168.1.50:50080`
if [ $http_code -ne 200 ]
   then
       echo "web is error"
   else
       echo "web is ok"
fi

2）利用系統函數，實現腳本啟動的特殊顏色效果，開發web服務的啟動腳本

[root@linux day4]# cat start_nginx.sh
#!/bin/sh
. /etc/init.d/functions
if [ $# -ne 1 ]
   then
       echo "USAGE $0 {start|stop|restart}"
   exit 1
fi
if [ "$1" == "start" ]
   then
       action "start nginx" /bin/true
elif [ "$1" == "stop" ]
   then
       action "stop nginx" /bin/true

elif [ "$1" == "restart" ]
   then
       action "restart nginx" /bin/true
else
   echo "USAGE $0 {start|stop|restart}"
   exit 1
fi

3）增加函數功能，實現上面的例子

[root@linux day4]# cat start_nginx02.sh
#!/bin/sh
. /etc/init.d/functions
start_nginx=/application/nginx/sbin/nginx
USAGE()
{       
   echo "USAGE $0 {start|stop|restart}"
   exit 1
}
if [ $# -ne 1 ]
   then
       USAGE
fi
if [ "$1" == "start" ]
   then
       $start_nginx
       action "start nginx" /bin/true
elif [ "$1" == "stop" ]
   then
       killall nginx
       action "stop nginx" /bin/true

elif [ "$1" == "restart" ]
   then
       pkill nginx
       sleep 2
       $start_nginx
       action "restart nginx" /bin/true
else
   USAGE
   exit 1
fi

四、shell函數

1）函數語法

shell函數語法
函數名()
{
	指令
	return n
}
或
function 函數名()
{
	指令
	return n
}

2）函數說明

【函數帶參數的說明】
1：函數體中位置參數（$1、$2、$3、$4、$5、$#、$*、$?以及$@）都可以是函數的參數
2：父腳本的參數則臨時地被函數參數所掩蓋或隱藏
3：$0比較特殊，它仍然是父腳本的名稱
4：當函數完成時，原來的命令行參數會恢復
5：在shell函數里面，return命令的功能的工作方式與exit相同，用於跳出函數
6：在shell函數體里使用exit會終止整個shell腳本
7：return語句會返回一個退出值給調用的程序

3）函數調用例子

[root@linux day4]# cat fun01.sh 
#!/bin/sh
oldboy01(){
   echo "I am caojin linux"
}
oldboy01
[root@linux day4]# sh fun01.sh 
I am caojin linux

4）函數傳參，判斷web服務是否正常

[root@linux day4]# cat check_web_by_fun.sh
#!/bin/sh
function Check_Url()
{
	curl -I -s $1 |head -1 && return 0||return 1
}
Check_Url $1
[root@linux day4]# sh check_web_by_fun.sh 192.168.1.50:50080
HTTP/1.1 200 OK
[root@linux day4]# sh check_web_by_fun.sh baidu.com
HTTP/1.1 200 OK

五、開發mysql·的啟動腳本

1）簡單版

已知mysql多實例啟動命令為：mysqld_safe --defaults-file=/data/3306/my.cnf &
停止命令為：mysqladmin -u root -p123 -S /data/3306/mysql.sock shutdown
=============================================================================
下面是單實例腳本
#!/bin/sh
. /etc/init.d/functions
path="/application/mysql/bin"
function usage(){
    echo "$0 {start|stop|restart}"
    exit 1
}
[ $# -ne 1 ] && usage

function start_mysql(){
    $path/mysqld_safe --user=mysql &
    if [ $? -eq 0 ]
        then
            action "start mysql" /bin/true
        else
            action "start mysql" /bin/false
    fi    
}
function stop_mysql(){
    mysqladmin -u root -p123456 shutdown
    if [ $? -eq 0 ]
        then
            action "stop mysql" /bin/true
        else
            action "stop mysql" /bin/false
    fi
}
if [ "$1" == "start" ]
    then
        start_mysql
elif [ "$1" == "stop" ]
    then
        stop_mysql
elif [ "$1" == "restart" ]
    then
        stop_mysql
        sleep 2
        start_mysql
else 
    usage        
fi

View Code

2）優化版，去掉mysql的啟動輸出

#!/bin/sh
. /etc/init.d/functions
# chkconfig: 2345 21 60
# description: start mysql and stop mysql scripts
path="/application/mysql/bin"
user=root
pass=123456
function usage(){
    echo "$0 {start|stop|restart}"
    exit 1
}
[ $# -ne 1 ] && usage

function start_mysql(){
    $path/mysqld_safe --user=mysql >dev/null 2>&1 &
    if [ $? -eq 0 ]
        then
            action "start mysql" /bin/true
        else
            action "start mysql" /bin/false
    fi    
}
function stop_mysql(){
    mysqladmin -u$user -p$pass shutdown >dev/null 2>&1
    if [ $? -eq 0 ]
        then
            action "stop mysql" /bin/true
        else
            action "stop mysql" /bin/false
    fi
}
if [ "$1" == "start" ]
    then
        start_mysql
elif [ "$1" == "stop" ]
    then
        stop_mysql
elif [ "$1" == "restart" ]
    then
        stop_mysql
        sleep 2
        start_mysql
else 
    usage        
fi

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3）添加到開機啟動

1）測試OK
2）cp start_db.sh /etc/init.d/mysqld
3）chmod +x /etc/init.d/mysqld
4）chkconfig --list mysqld
5）chkconfig --add mysqld
6）chkconfig mysqld on
7）chkconfig --list mysqld
8）ll /etc/rc.d/rc3.d/|grep mysqld

# chkconfig: 2345 21 60 #2345 啟動級別，  #21 開機啟動順序， # 60 關機順序

六、輸出顏色方法

1）echo 輸出字符串顯示不同顏色范例

echo -e "\033[30m 黑色字caojin tarinning \033[0m"
echo -e "\033[31m 紅色字caojin tarinning \033[0m"
echo -e "\033[32m 綠色字caojin tarinning \033[0m"
echo -e "\033[33m 黃色字caojin tarinning \033[0m"
echo -e "\033[34m 藍色字caojin tarinning \033[0m"
echo -e "\033[35m 紫字caojin tarinning \033[0m"
echo -e "\033[36m 天藍字caojin tarinning \033[0m"
echo -e "\033[37m 白色字caojin tarinning \033[0m"

2）字背景顏色范圍：40------47

echo -e "40;37m 黑底白字 whlcome to China\033[0m"
echo -e "41;37m 黑底白字 whlcome to China\033[0m"
echo -e "42;37m 黑底白字 whlcome to China\033[0m"
echo -e "43;37m 黑底白字 whlcome to China\033[0m"
echo -e "44;37m 黑底白字 whlcome to China\033[0m"
echo -e "45;37m 黑底白字 whlcome to China\033[0m"
echo -e "46;37m 黑底白字 whlcome to China\033[0m"
echo -e "47;30m 黑底白字 whlcome to China\033[0m"

3）簡單顏色腳本

[root@oldboy66 day4]# cat echo-color.sh
#!/bin/bash
RED_COLOR='\E[1;31m'
GREEN_COLOR='\E[1;32m'
YELLOW_COLOR='\E[1;33m'
BLUE_COLOR='\E[1;34m'
PINK='\E[1;35m'
RES='\E[0m'
echo -e "${RED_COLOR}====red color===={$RES}"
echo -e "${YELLOW_COLOR}====yellow color===={$RES}"
echo -e "${BLUE_COLOR}====blue color===={$RES}"
echo -e "${GREEN_COLOR}====green color===={$RES}"
echo -e "${PINK}====pink color===={$RES}"

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七、case結構條件句

1）基本語法

case "字符串變量" in
	值1）指令1...
;;
	值2）指令2...
;;
	*）指令...
esac

2）case創建水果菜單，增加特殊顏色

[root@linux day4]# cat fruit_menu.sh 
#!/bin/sh
RED_COLOR='\E[1;31m'
GREEN_COLOR='\E[1;32m'
YELLOW_COLOR='\E[1;33m'
BLUE_COLOR='\E[1;33m'
RES='\E[0m'
menu(){
cat <<END
==========
1.apple
2.pear
3.banana
4.exit
=========
END
}
while true
do menu
read -p "pls input your choice:" fruit
case "$fruit" in
    1)
      echo -e "$RED_COLOR apple $RES"
      ;;
    2)
      echo -e "$GREEN_COLOR pear $RES"
      ;;
    3)
      echo -e "$YELLOW_COLOR banana $RES"
      ;;
    4)
      exit 0
      ;;
    *)
      echo -e "no fruit you choose."
esac
done

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3）利用傳參的形式給對象增加顏色

[root@oldboy66 day4]# cat plus_color.sh 
#!/bin/bash
RED_COLOR='\E[1;31m'
GREEN_COLOR='\E[1;32m'
YELLOW_COLOR='\E[1;33m'
BLUE_COLOR='\E[1;34m'
PINK='\E[1;35m'
RES='\E[0m'
if [ $# -ne 2 ];then
    echo "Usage $0 content {red|yellow|blue|green}"
    exit
fi
case "$2" in
    red|RED)
        echo -e "${RED_COLOR}$1${RES}"
        ;;
    green|RED)
        echo -e "${GREEN_COLOR}$1${RES}"
        ;;
    yellow|RED)
        echo -e "${YELLOW_COLOR}$1${RES}"
        ;;
    blue|RED)
        echo -e "${BLUE_COLOR}$1${RES}"
        ;;
    pink|RED)
        echo -e "${PINK_COLOR}$1${RES}"
        ;;
    *)
        echo "Usage $0 content {red|yellow|blue|green}"
        exit
esac

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4）案例開發類似於rsync的啟動腳本

例如：/etc/init.d/rsynd {start|stop|restart}
[root@oldboy66 etc]# rsync --daemon
[root@oldboy66 etc]# lsof -i :873
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
rsync   6056 root    4u  IPv4  22839      0t0  TCP *:rsync (LISTEN)
rsync   6056 root    5u  IPv6  22840      0t0  TCP *:rsync (LISTEN)
[root@oldboy66 etc]# cat /var/run/rsyncd.pid
6056        目的生成pid        根據pid來做操作
[root@oldboy66 day5]# cat rsyncd.sh 
#!/bin/sh
pidfile="/var/run/rsyncd.pid"
start_rsync(){
if [ -f "$pidfile" ]
   then
       echo "rsync is running"
   else
       rsync --daemon
       echo "rsync is started"
fi
}
stop_rsync(){
if [ -f $pidfile ]
   then
       kill -USR2 `cat $pidfile`
       rm -f ${pidfile}
       echo "rsync is stopped"
   else
       echo "rsync have already been stopped"
fi
}
case "$1" in
   start)
       start_rsync
       RETVAL=$?
       ;;
   stop)
       stop_rsync
       RETVAL=$?
       ;;
   restart)
       stop_rsync
       sleep 2
       start_rsync
       RETVAL=$?
       ;;
   *)
       echo "USACE:$0 {start|stop|restart}"
       exit 1
esac
exit $RETVAL

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注意：此腳本並不完善，可以加載函數，添加顏色，讓其開機自啟動（chkconfig）

八、while循環，以及until循環

1）while語法

while 條件句
	do
	指令...
done

2）until語法

until 條件
	do
	指令....
done

3）while循環，守護進程舉例

提示：while true表示永遠為真，因此會一直運行，像死循環一樣，但是我們稱呼為守護進程

[root@linux day5]# cat while.sh 
#!/bin/sh
while true
do
   uptime
   sleep 2
done

腳本在后台執行

腳本在后台執行知識擴展：
功能			用途
sh while.sh &		把腳本while.sh放到后台執行
ctrl+c			停止執行當前腳本或任務
ctrl+z			暫停執行當前腳本或任務
bg			把當前腳本或任務放到后台執行	background
fg			當前腳本或任務拿到前台執行，如果

如果執行的腳本忘記在后台執行

[root@oldboy66 day5]# sh while.sh 

^Z
[1]+  Stopped                 sh while.sh
[root@oldboy66 day5]# bg
[1]+ sh while.sh &
[root@oldboy66 day5]#

4）while計算1加到100的和

方法一

[root@linux day5]# cat while_sum.sh
#!/bin/sh
i=1
sum=0
while [ $i -le 100 ]
do
   let sum=sum+i
   let i=i+1
done
echo $sum
[root@oldboy66 day5]# sh while_sum.sh
5050

方法二

[root@linux day5]# sh while_sum.sh
5050
或
[root@oldboy66 day5]# cat while_sum2.sh 
#!/bin/sh
i=1
sum=0
while ((i < 101))
do
   ((sum=sum+i))
   ((i++))
done
echo $sum

5）計算Apache一天的日志access_2016-12-8.log中所有行的日志各元素的訪問字節數的總和。給出實現程序。用while循環實現

[root@linux day5]# cat log.sh 
#!/bin/sh
sum=0
i=0
while read line
do
   i=$(echo $line|awk '{print $10}') 
   if expr $i + 0 &>/dev/null
      then
       	 ((sum=sum+i))
   fi
done <access_2015_12_8.log
echo $sum

6）while循環做抓鬮小游戲

要求：

[ 1 ]每個人都輸入名字，然后隨機產生不同的數字（1--99）

[ 2 ]第一個輸入名字后，屏幕輸出信息，並將名字和數字記錄到文件里，程序不能退出，繼續等待別的學生輸入。

　[ 3 ]輸出的名字與對應的數字的最大則是被抓到的人

http://oldboy.blog.51cto.com/2561410/1308647
[root@localhost test]# cat za.sh 
#!/bin/sh
[ ! -f file ] && touch file
while true;
do
    read -p '輸入:' you
    if [ -n "$you" ] && ! egrep "^$you.*" file;then
          while true;
          do
                rannum=$(expr $RANDOM % 99 ＋ 1)
                if ! egrep "$you number is $rannum" file ;then
                    echo "$you number is $rannum" >> file
                    break
                fi
          done
          if [ "$you" == 'exit' ];then
                break
          fi
    fi
done
[root@localhost test]# sh za.sh 
輸入:asd
輸入:qwe
輸入:asd
asd number is 40
輸入:qwe
qwe number is 1
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七、rsync 數據同步

范例：每10秒鍾做一次rsync binlog推送，通過守護進程方式，寫完腳本后台執行。當配好rsync服務時，可以直接用的腳本

[root@linux day5]# cat rsync_binlog.sh
#!/bin/sh
while true
do
   rsync -az /data/3306/mysql-bin* rsync_backup@192.168.1.49::backup --password-file=/etc/rsync.password &
   sleep 10
done

八、for循環

1）for循環簡單例子

[root@linux day6]# cat for.sh 
#!/bin/sh
for n in 5 4 3 2 1
do
   echo $n
done

2）開發腳本實現僅設置sshd rsyslog crond network sysstat開機自啟動

[root@linux day6]# cat auto_start.sh
#!/bin/sh
for name in `chkconfig --list|grep 3:on|awk '{print $1}'`
do
   chkconfig $name off
done
for name in rsyslog network crond sshd systtat
do
   chkconfig $name on
done

3）for循環在/oldboy目錄下批量創建10個文件，名稱依次為：oldboy-1.html.....

[root@linux day6]# cat for_mkdir.sh 
#!/bin/sh
[ ! -d /oldboy ] && mkdir -p /oldboy
for i in `seq 10`
do
   touch /oldboy/oldboy-${i}.html
done

4）用for循環實現將以上文件名中的oldboy全部改為Linux，並且擴展名改為大寫。要求for循環的循環體不能出現oldboy字符串

[root@linux day6]# cat for_xiugai.sh 
#!/bin/sh
for i in `seq 10`
do
   cd /oldboy
   mv oldboy-$i.html linux-$i.HTML
done
或
[root@linux day6]# cat for_xiugai2.sh 
#!/bin/sh
cd /oldboy
for f in `ls *.html`
do
#   mv $f `echo $f|sed 's#oldboy#linux#g'|sed 's#html#HTML#g'`
    mv $f `echo $f|sed 's#oldboy\(.*\).html#linux\1.HTML#g'`
done

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批量改名案例：http://oldboy.blog.51cto.com/2561410/711342

5）批量創建10個用戶並設置密碼

[root@linux day6]# cat for_mima.sh 
#!/bin/sh
for n in `seq -w 10`
do
   useradd oldboy$n &&\
   echo "root$n"|passwd --stdin oldboy$n
done
或
[root@linux day6]# cat for_mima2.sh 
#!/bin/sh
for n in `seq -w 10`
do
    useradd oldboy$n -p root$n
#   userdel -r oldboy$n
#   useradd oldboy$n &&\
#   echo "root$n"|passwd --stdin oldboy$n
done

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九、隨機數

1）獲取隨機數的7個方法

[root@linux day6]# echo $RANDOM
[root@linux day6]# openssl rand -base64 8
[root@linux day6]# date +%s%N
[root@linux day6]# head /dev/urandom|cksum
[root@linux day6]# cat /proc/sys/kernel/random/uuid
[root@linux day6]# yum install expect -y
[root@linux day6]# mkpasswd -l 8

2）生產隨機數

[root@oldboy66 day6]# echo $RANDOM
17123
[root@oldboy66 day6]# echo $RANDOM
23696
[root@oldboy66 day6]# echo $((RANDOM+10000000))
10028068
[root@oldboy66 day6]# echo $((RANDOM+10000000))
10016282
[root@oldboy66 day6]# echo $RANDOM|md5sum|cut -c 1-8
100764b3
[root@oldboy66 day6]# echo $RANDOM|md5sum|cut -c 1-8
3447b18d
下面是高級隨機
[root@oldboy66 day6]# echo "`date`$RANDOM"|md5sum|cut -c 1-8
c78d73a8
[root@oldboy66 day6]# echo "`date`$RANDOM"|md5sum|cut -c 1-8
82d4b31e

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