第三周

Posted 2021-09-03 amy_itx_aps

第三周

1、统计出/etc/passwd文件中其默认shell为非/sbin/nologin的用户个数，并将用户都显示出来

方法1
[root@centos79 ~]# grep -iEv \'/sbin/nologin\' passwd|cut -d\':\' -f1,7|sort |uniq -c
      1 gonghairong:/bin/bash
      1 halt:/sbin/halt
      1 root:/bin/bash
      1 shutdown:/sbin/shutdown
      1 sync:/bin/sync
      1 user1:/bin/bash
      1 user2:/bin/bash
      1 user3:/bin/bash
方法2
[root@centos79 ~]# grep -ivE  "/sbin/nologin$" passwd |awk -F ":" \'{print $1,$NF}\'|sort |uniq  -c 
      1 gonghairong /bin/bash
      1 halt /sbin/halt
      1 root /bin/bash
      1 shutdown /sbin/shutdown
      1 sync /bin/sync
      1 user1 /bin/bash
      1 user2 /bin/bash
      1 user3 /bin/bash

2、查出用户UID最大值的用户名、UID及shell类型
    方法1
    [root@centos79 ~]# sort -t\':\' -k 3 -nr passwd |cut -d\':\' -f1,3,7|head -n 1
    nfsnobody:65534:/sbin/nologin

    方法2
    [root@centos79 ~]# awk -F ":" \'{print $1,$3,$7}\' passwd | tail -n 1
    nfsnobody 65534 /sbin/nologin

3、统计当前连接本机的每个远程主机IP的连接数，并按从大到小排序
    
    [root@centos79 ~]#    ss -nt|grep -vi "state"|grep -E "([0-9]{1,3}\\.){3}[0-9]{1,3}:[0-9]+[[:space:]]*$"|grep -Eo "([0-9]{1,3}\\.){3}[0-9]{1,3}"|sort -nr|uniq -c
          9 192.168.80.1
          9 192.168.80.3

4、编写脚本disk.sh，显示当前硬盘分区中空间利用率最大的值

    #[root@centos79 data]# df -h|grep -iE "^/dev/" | grep -Eo "[0-9]+%"|grep -Eo  "[0-9]+"|sort -rn |head -n 1
    100

    #df -h |tr -s \' \'| cut -d" " -f5| grep -Eo "[0-9]+" |sort -rn |head -n 1
    100

[root@centos79 ~]# vim disk.sh

#!/bin/bash
#=====================================================================================================
#File Name:           disk.sh
#Date:                2021-09-02 20-56-07
#Author:              Create by gong hai rong
#Description:         This script function is
#Shell Version:       GNU bash version 4.1.2(2)-release x86_64-redhat-linux-gnu
#Copyright (C):       2021 All rights reserved
#=====================================================================================================

warning=85

RED_COLOR=\'\\E[1;31m\'

GREEN_COLOR=\'\\E[1;32m\'

YELOW_COLOR=\'\\E[1;33m\'

BLUE_COLOR=\'\\E[1;34m\'

PINK=\'\\E[1;35m\'

RES=\'\\E[0m\'

c00=\'\\033[40;32m\'

c01=\'\\033[40;31m\'

rq=$(date +%Y-%m-%d\'-\'%H-%M-%S)

export TIME_STYLE=\'+%Y-%m-%d %H:%M:%S\'

export TMOUT=864000

export LANG=en_US.UTF-8

#df -h|grep -iE "^/dev/" | grep -Eo "[0-9]+%"|grep -Eo  "[0-9]+"|sort -rn |head -n 1

diskused_max=$(df -h |tr -s \' \'| cut -d" " -f5| grep -Eo "[0-9]+" |sort -rn |head -n 1)

diskused_list=$(df -h |tr -s \' \'| cut -d" " -f5| grep -Eo "[0-9]+" |sort -rn )

echo

echo -e "$RED_COLOR$rq disk used max: $diskused_max%$RES"

echo

#echo -e  "disk used list :  $diskused_list"

#disk_used_list=$(df -h |tr -s \' \'|grep -i "^/dev*"|cut -d " " -f1,5,6)

echo -e "${GREEN_COLOR}disk used list\\n`df -h |tr -s \' \'|grep -i "^/dev"|cut -d " " -f1,5,6|tee u.log` $RES"

echo

#df -h |tr -s \' \'|grep -i "^/dev"|cut -d " " -f1,5,6>u.log

while read i
do
{
        dev=$(echo "$i"|cut -d\' \' -f1)
        num=$(echo "$i"|cut -d\' \' -f2|cut -d\'%\' -f1)
        mp=$(echo  "$i"|cut -d\' \' -f3)

        if [ "$num"  -ge "$warning"   ];then

                #echo -e  "${RED_COLOR} 磁盘空间严重告警 快快处理 老板要扣钱了 $RES "
                echo  -e "${RED_COLOR}$rq $dev $pm used: $num 磁盘空间严重告警 快快处理 老板要扣钱了 $RES"

        fi

}&

done<u.log
wait

#echo ok

 

5、编写脚本 systeminfo.sh，显示当前主机系统信息，包括:主机名，IPv4地址，操作系统版本，内核版本，CPU型号，内存大小，硬盘大小

[root@centos79 data]#vim systeminfo.sh

#!/bin/bash
#=====================================================================================================
#File Name:           systeminfo.sh
#Date:                2021-09-02 20-53-09
#Author:              Create by gong hai rong
#Description:         This script function is
#Shell Version:       GNU bash version 4.1.2(2)-release x86_64-redhat-linux-gnu
#Copyright (C):       2021 All rights reserved
#=====================================================================================================

ED_COLOR=\'\\E[1;31m\'

GREEN_COLOR=\'\\E[1;32m\'

YELOW_COLOR=\'\\E[1;33m\'

BLUE_COLOR=\'\\E[1;34m\'

PINK=\'\\E[1;35m\'

RES=\'\\E[0m\'

c00=\'\\033[40;32m\'

c01=\'\\033[40;31m\'

#hostname
host_name0=$(hostname)

host_name1=$HOSTNAME

host_name2=`uname -m`

host_name3=$(sed -n \'p\' /etc/hostname )

hostname_name4=$(cat /etc/hostname)

hostname5=$(hostnamectl status | grep -i "Static hostname" |tr -s \'\'| cut -d":" -f2 |grep -o "\\<.*\\>")

## ipaddress
ipaddress0=$(ifconfig ens32 |grep -i "^.*inet\\>.*\\>"|grep -io  "[0-9]\\{1,3\\}[.][0-9]\\{1,3\\}[.][0-9]\\{1,3\\}[.][0-9]\\{1,3\\}" |head -n 1)

ipaddress1=$(ifconfig ens32 |grep -i "^.*inet\\>.*\\>"|grep -io  "[0-9]\\{1,3\\}\\.[0-9]\\{1,3\\}\\.[0-9]\\{1,3\\}\\.[0-9]\\{1,3\\}" |head -n 1)

ipaddress2=$(ifconfig ens32| grep ".*inet\\>"|grep -io  "\\([0-9]\\{1,3\\}[.]\\)\\{3\\}[0-9]\\{1,3\\}"|head -n 1)

ipaddress3=$(ifconfig ens32|grep -i ".*inet\\>"|grep -iEo "[0-9]+.[0-9]+.[0-9]+.[0-9]+" |head -n 1)

ipaddress4=$(ifconfig ens32 |grep -i ".*inet\\>"|grep  -iEo   "([0-9]+[.]){1,3}[0-9]+"|head -n 1)

osversion=$(cat /etc/redhat-release )

kernelversion=$(uname -r)

cpu=$(lscpu |sed -n \'/Model name/Ip\'|tr -s \' \'|cut -d\':\' -f2)

mem=$(free -h|tr -s \' \'   |grep -iEo "[0-9]+m.*"|cut -d\' \' -f1)

disk=$(lsblk |grep \'^sd\' |tr -s \' \' |cut -d " " -f1,4)

echo -e "$GREEN_COLOR=======================================echo $(date +%Y-%m-%d\'-\'%H-%M-%S) System Info ===================================================================$RES\\t\\n"

echo -e "IPADDRESS:     $ipaddress0"
echo -e "OSVERSION:     $osversion"
echo -e "KERNEL:         $kernelversion"
echo -e "CPU:          $cpu"
echo -e "MEMORY:         $mem\\t"
echo -e "DISK:\\n$disk"

echo -e "$GREEN_COLOR=======================================echo $(date +%Y-%m-%d\'-\'%H-%M-%S) System Info ===================================================================$RES\\t\\n"

printf "IPADDRESS:%-10s$ipaddress0\\n"
printf "OSVERSION:%-10s$osversion\\n"
printf "KERNEL:%-10s   $kernelversion\\n"
printf "10sCPU:%-10s  $cpu\\n"
printf "MEMORY:%-10s   $mem\\n"
printf "DISK:%-10s\\n$disk\\n"

echo -e "$GREEN_COLOR=======================================printf $(date +%Y-%m-%d\'-\'%H-%M-%S) System Info ===================================================================$RES\\t\\n"

6、20分钟内通关vimtutor（可参考https://yyqing.me/post/2017/2017-02-22-vimtutor-chinese-summary）