1, sudo can use super permissions
2, ctrl+alt+T to open the command box
3, nano is to open and create a file {and gedic command and vi command}
4. Compile the c program: gcc -o test 1.c {where 1.c is the file name}
Compile the C++ program: g++ -o test 1.c
[Then after the compilation is completed, a diamond-shaped file will be generated in the file, which is the executable file]
5 ， rm -r 1.c
{that is, delete the file 1.c}
6，./1.c
{is to execute this command}
7. For python, it is much simpler.
After creating the file, enter "python 1.py" directly in the command box to run the file directly
8, find -name haha.
You can find all the files named "haha" in the computer.
9，cat text.c
Just don't open it, you can view your test.c, the content of this file.
10，cat test.c test.cpp >test1.txt
It is to combine the contents of the two files test.c and test.cpp and then add them to the file test1.txt
11. cd folder
enter a folder
12，cd ～
back to desktop
13，$
This is the variable symbol
E.g:
14, put all files under one file
15. If the camera cannot be turned on, check whether the corresponding number of the camera is different
16，mkdir aa
is to create a folder named aa
17, mv move
mv can only operate on one folder
18，cp
cp -r new1 new2
Copy to new1 to new2
19. Check the version of python
python
import cv2
print cv2.--version--