2022.07.05

Class hour 16 Add

 

Because of my ubuntu Not installed at first ssh The server , So you need to install it first .

Installation can be used

sudo apt-get install openssh-server

This command .

  Once installed , recycling serve ssh status This command checks whether it is connected .

There is active（running） Prove that the connection was successful .

When demonstrating the connection between two hosts , Two virtual machines are needed , Cloning is needed here .

First, in the ubuntu Click on “ management ”.

“ management ” Under Options “ Customize ”, And then choose “ library ”.

After selection, the following interface will appear .

 

Then right click on the system , choice “ snapshot ”-“ take snapshot ”, Just save the snapshot directly .

Finally, right click again , choice “ management ”-“ clone ”.

  Class hour 17

 

 

 

Check the operation of the process , amount to windows Task manager .

 

  Class hour 18

 

 

 

 

answer ：

1. There are three kinds of permissions ：r（ read ）w（ Write ）x（ perform ）. 

There are only three roles for users ,ugo.

2.ping.

3.ps-ajx,ps-aux Fine .

4.kill

5.ping

6. Specify size ,ping -s, end ping command ,ping -c

7.pop

8. 7 On behalf of the highest authority ,5 The representative has read and execute permission ,chmod  u=rxw,g=rx,o=rx

9.df

  Class hour 20

 

Class hour 21linux File search

 

 

  Class hour 22

 

 

 

 

 

 

 

 

 

 

 

 

  Class hour 23