Linux pre-stage classroom Test 2

1. The modification time is 2016-11-01 12:06:26;

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2. After the successful modification, according to the format of%y-%m-%d output, and save the output of one copy to/mnt/date.txt;

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3. Review the date 80 days ago, redirect to file/mnt/datafile, and then view the date 80 days later,
Append to file/mnt/datafile;

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4. Use a command to view the number of bytes, characters, lines, and words of the/mnt/datafile file;

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5. Execute the most recent command with the "date" keyword via a shortcut;

Ctrl+r

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6. Use a command to create a file in the/mnt directory westosx_filey,x the range of values for {a,b,c},y is 8-13;

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7. Move the Westosx_filey files to the/tmp directory;

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8. Copy/etc/group files to/mnt;

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-Vim Edit the file, copy the first three lines, Paste to line 5th

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-Clip Line 5th, paste to the last line;

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-delete the third line to the bottom;

DD 64 Line
-add root words at the beginning of 3-10 rows;

Ctal+v I ESC

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-Replace the root in 5-10 rows with a kiosk in the left and right split-screen case;

Ctrl+w v:5,10s/root/kiosk/g

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Ctrl+w s

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9. Configure VIM to have the following functions when editing a file: Display line number, mouse can manipulate cursor position;

Vim/etc/vimrc

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10. User and User group operations
-Create User group phone, specify the GID is 888, the following new users belong to the phone user group;
-Create user mi, set Uid=1800,shell type to/bin/sh;
-Create user iphone, set uid=1801, user described as "subscriber iphone";
-Create user Huawei, set user description as "Huawei", user home directory for/huawei;

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* * For business needs, do the following:
-Modify the UID of the user mi to 1700,shell different type for/sbin/nologin;
-Modify User's iphone description as "Apple phone";
-Modify user's home directory for Huawei/home/huawei;

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11. (password management) an administrator establishes a user admin for managing accounts that meets the following criteria:
-uid=7777,gid=7777, user described as "system administrator";

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-New user group BANK1,BANK2, so that the newly created user group is an additional group of admin users;

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-Set Admin user's password to "AdminPassword";

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-Change the password to use the number of days to 0, so that the user must change the password for the first time;

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-Change Password minimum validity is 7, so that the user set the password wait 7 days before the password can be changed again;

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-Delegating permissions to the Admin user so that the user can create a new user (no password method).

Visudo

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12. Create a public directory/pubdir, so that all users can write to the directory, but only to delete their own files or directories;

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13. Show CPU usage in the first five PID, and redirect to file/mnt/pidfile;

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14. Display the user who tried to log in to your host but not logged in successfully, save to/mnt/login_fail.txt file;

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15. Set the SSH server side, do not allow remote connection through password authentication;

Vim/etc/ssh/sshd_config

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Systemctl Restart Sshd.service

16. Packaging compression/mnt file for the tar.gz format, the implementation of no password (that is, through the key authentication) to send the compression package to the real Machine kiosk user's desktop;

Practice using Virtual machine server instead of a real machine kiosk as an example

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Server

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Result: no password verification transfer succeeded

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17. Realize the time synchronization between your host and 172.25.254.250 host;

Server-side

Vim/etc/chrony.conf

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Systemctl Restart Chronyd.service

Client

Vim/etc/chrony.conf

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Systemctl Restart Chronyd.service

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18. Set your host's time zone to Africa/conakry;

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19. Sync all the log information on your console to the real machine;

Practice using Virtual machine server instead of a real machine kiosk as an example

Host side

Vim/etc/rsyslog.conf

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Server Side

Vim/etc/rsyslog.conf

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20. Set your real IP to 172.25.254.x via the NMCLI command (x is your real machine IP plus 100), the gateway is 172.25.254.250;
21. Set up your host DHCP acquisition IP through the management profile;
22. Build local yum Repository, use Yum to install LFTP and vsftpd software, uninstall VSFTPD software after installation.

Linux pre-stage classroom Test 2