Linux每日一练第3天 | 第三天：Linux 高级命令学习心得

Linux每日一练第3天 | 第三天：Linux 高级命令学习心得

https://luciferliu.blog.csdn.net/article/details/122393279

这里写自定义目录标题

第三天：Linux 高级命令

学习收获学习目标课后作业

1.配置本地YUM源，并安装zip软件2. 配置防火墙3. 查找和替换文件4. 配置定时任务5. 配置佛主保佑 相关链接

第三天：Linux 高级命令 学习收获

今天学习《每日一练：三天入门Linux系统》第三天课程：Linux 高级命令，赶紧把作业做起来！

三天LInux学习很快就结束了，非常感谢老师把命令按分类整理的这么好，Linux 命令是工作必备技能，经过实 *** 才能更好掌握。老师的课程不错，后续有人需要也会推荐~~

学习目标

Linux 高级命令，版本CentOS 7.9

课后作业

1.配置本地YUM源，并安装zip软件

1.本地光驱挂载ISO安装包

手动设置yum源文件

[root@Centos7-111 ~]# mount /dev/cdrom /mnt
mount: /dev/sr0 is write-protected, mounting read-only
[root@Centos7-111 ~]# mkdir /etc/yum.repos.d/bak
[root@Centos7-111 ~]# mv /etc/yum.repos.d/* /etc/yum.repos.d/bak
mv: cannot move ‘/etc/yum.repos.d/bak’ to a subdirectory of itself, ‘/etc/yum.repos.d/bak/bak’
[root@Centos7-111 ~]# {
>   echo "[local]"
>   echo "name=local"
>   echo "baseurl=file:///mnt"
>   echo "enabled=1"
>   echo "gpgcheck=0"
> } >/etc/yum.repos.d/local.repo
[root@Centos7-111 ~]# cd /etc/yum.repos.d/
[root@Centos7-111 yum.repos.d]# cat local.repo 
[local]
name=local
baseurl=file:///mnt
enabled=1
gpgcheck=0

查看本地镜像源

[root@Centos7-111 yum.repos.d]# yum repolist all
Loaded plugins: fastestmirror
Determining fastest mirrors
local                                              | 3.6 kB     00:00     
(1/2): local/group_gz                                | 3.5 kB   00:00     
(2/2): local/primary_db                              | 832 kB   00:00     
repo id                         repo name                     status
local                           local                         enabled: 447
repolist: 447

安装zip包

[root@Centos7-111 yum.repos.d]# 
[root@Centos7-111 yum.repos.d]# yum install -y zip
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package zip.x86_64 0:3.0-11.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==========================================================================
 Package      Arch            Version                Repository      Size
==========================================================================
Installing:
 zip          x86_64          3.0-11.el7             local          260 k

Transaction Summary
==========================================================================
Install  1 Package

Total download size: 260 k
Installed size: 796 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : zip-3.0-11.el7.x86_64                                  1/1 
  Verifying  : zip-3.0-11.el7.x86_64                                  1/1 

Installed:
  zip.x86_64 0:3.0-11.el7                                                 

Complete!

安装成功

2. 配置防火墙

查询防火墙开启端口和状态

[root@Centos7-111 ~]# firewall-cmd --list-port

[root@Centos7-111 ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2022-01-22 14:43:35 CST; 3h 53min ago
     Docs: man:firewalld(1)
 Main PID: 661 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─661 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --no...

Jan 22 14:43:34 Centos7-111 systemd[1]: Starting firewalld - dynamic f....
Jan 22 14:43:35 Centos7-111 systemd[1]: Started firewalld - dynamic fi....
Jan 22 14:43:35 Centos7-111 firewalld[661]: WARNING: AllowZoneDrifting ...
Hint: Some lines were ellipsized, use -l to show in full.
··· 

配置80端口，然后重启防火墙后，查询80端口已设置

···
[root@Centos7-111 ~]# firewall-cmd --zone=public --add-port=80/tcp --permanent
success
[root@Centos7-111 ~]# firewall-cmd --list-port

[root@Centos7-111 ~]# firewall-cmd --reload
success
[root@Centos7-111 ~]# firewall-cmd --list-port
80/tcp
[root@Centos7-111 ~]# firewall-cmd --query-port=80/tcp
yes

3. 查找和替换文件

生成一个test.txt，然后查找 ftp 的内容

[root@Centos7-111 ~]# cat /etc/passwd > /tmp/test.txt
[root@Centos7-111 ~]# find / -name test.txt
/tmp/test.txt
[root@Centos7-111 ~]# grep "ftp" /tmp/test.txt 
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
[root@Centos7-111 ~]#

替换内容，将一行加上备注 #

[root@Centos7-111 ~]# grep "nobody" /tmp/test.txt 
nobody:x:99:99:Nobody:/:/sbin/nologin
[root@Centos7-111 ~]# sed -i 's/nobody/#nobody/g' /tmp/test.txt 
[root@Centos7-111 ~]# grep "nobody" /tmp/test.txt 
#nobody:x:99:99:Nobody:/:/sbin/nologin

4. 配置定时任务

[root@Centos7-111 ~]# crontab -l
no crontab for root
[root@Centos7-111 ~]# crontab -e
no crontab for root - using an empty one
crontab: installing new crontab
[root@Centos7-111 ~]# crontab -l
35      *       *         *     *     ls
[root@Centos7-111 ~]# date
Sat Jan 22 19:29:53 CST 2022

5. 配置佛主保佑

编辑 /etc/motd
···
[root@Centos7-111 ~]# vi /etc/motd

---

               _ooOoo_
              o8888888o
              88" . "88
              (| -_- |)
              O  =  /O
           ____/`---'____
         .'  \|     |//  `.
        /  \|||  :  |||//  
       /  _||||| -:- |||||-  
       |   | \  -  /// |   |
       | _|  ''---/''  |   |
         .-__  `-`  ___/-. /
     ___`. .'  /--.--  `. . __
  ."" '<  `.____<|>_/___.'  >'"".
 | | :  `- `.;` _ /`;.`/ - ` : | |
    `-.   _ __ /__ _/   .-` /  /

======-.____-._/__.-____.-'=======—=’
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
佛祖保佑 永无BUG

···

再次连接到服务器，真的显示佛祖保佑了

第3天作业真多，终于完成了，可以休息一会了~~~

三天打卡全部完成，内容很好，感谢版主！！

相关链接

[1] 活动介绍：http://t.csdn.cn/d3wNw
[2] 学习内容：三天入门Linux系统
[3] 第三天：Linux 高级命令