20180608 Morning Lesson Records 27-linux

What is 1.PWD?

Displays the absolute path where you are currently

2. What is the difference between absolute and relative paths

Absolute path is starting from/directory
Relative paths are relative to where they are today

3. Switch to the previous command

CD-

4. Switch to the previous level command

Cd..

5. Switch to home directory which commands

CD CD ~

6. Create a file, what commands do you think can

VI or VIM
Touch
Other redirects

7. What are the commands and cascading creation parameters for creating a folder?

Mkdir-p

8. Check the command help, we want to see what the first line

Usage

9. Historical command and execution 55 lines

History!55

10. Do a bad thing, empty your history command, which file

. bash_history

11. Force delete a Folder command

Rm-rf

12.which xxx, then find xxx is actually from which environment variable to look for

PATH

13. Current directory search only remember the name has XXX file

Find./-name "xxx"

14. See what the process number and port number commands are

Ps-ef | grep xxx
NETSTAT-NLP |grep XXX

15. command to kill a process

Kill-9 PID

16. Machine card, which command to see which process consumes large resources

Top

17. How much memory and disk commands

Free-m
Df-h

How many 18.rwx numbers

421

19. Modify the commands for users and user groups

Chown

What are the 20.tar decompression and compression parameters?

-xzvf-cvf

21.screen tell me about your understanding.

Set up a reply

22. What is the global environment variable and the personal environment variable file, and what is the effective command?

Global/etc/profile Source/etc/profile in effect
Personal ~/.bash_profile Source ~/.bash_profile effective

20180608 Morning Lesson Records 27-linux