20180503 Morning Lesson Records 02-linux

1. What is the command to move a file or folder?

Mv

2. What are the command parameters for copying a file or folder?

Cp

3. Forcing the deletion of a file's command parameters

Rm-r

4. Force delete a folder's command parameters

Rm-rf

5. Is the production capable of performing RM-RF/

No

6. Switch User's command parameters with execution environment variable file and into home directory

Su-xxx

7. Ordinary users want to temporarily get root maximum permissions, modify which file

/etc/sudoers

8. View command Help

--help or man xxx

9. View historical commands and execute 55 lines

History! 55

10. Create an empty File command

Touch xxx

11. Commands for creating folders

Mkdir

12. What are the parameters for creating a cascading folder

Mkdir-p

13. View commands for processes running in the background

Ps-ef

14. Kill a Process

Kill-9 PID

15. View the port number command for this process 955

Netatat-nlp|grep 955

16. How to set a temporary alias

Alias

17. Set the variable key= value, is that right?

No, there's no space.

18. Environment variable files are divided into global and individual, then where and how to take effect

Global:/etc/profile Execution Source/etc/profile effective
Personal: ~/.bash_profile or ~/.BASHRC execute source ~/.bash_profile effective

19. What are the commands for viewing the contents of a file

Cat
More
Less
Tail

20. What does the hidden file begin with?

.

What is the difference between 21.tail-f and-F?

Tail-f is equivalent to--follow=descriptor, tracking according to the file descriptor, when the file is renamed or deleted, the trace stops
Tail-f is equivalent to--follow=name--retry, tracked according to the file name, and remains retried, that is, after the file has been deleted or renamed, if you create the same file name again, you will continue to track

22. If a xxx, to kill all processes related to XXX, then we do the first step? What's the second step?

First step ps-ef|grep XXX view
The second kill-9 PID kill

23. Create a user command

Useradd

24. Create a command for a user group

Groupadd

25. What are the profiles of users and user groups?

/etc/passwd
/etc/group

26. General view of the user's situation, using the ID ruoze, then how to say Bigdata user group added to Ruoze

Usermod-a-G Bigdata ruoze

27. command to set a password

passwd xxx

28. What symbol is a pipe character

|

29. View the current machine's IP command (Linux)

Ifconfig

30. Say VI, how to edit a file input, and then save the exit

I--Enter edit mode
ESC--Exit Edit
: Wq--Save exit

20180503 Morning Lesson Records 02-linux