UNIX Permissions - table

Unix/Linux Permissions:

Here is the list of values and what they stand for in unix folder/directory permissions.Basically it is a simple you can count the value by using octa decimal binary numbers 421 :

See below image 

Value 0 directory listing is 000 = 0+0+0 

Value 1 directory listing is 001 = 0+0+1

Value 2 directory listing is 020 = 0+0+0  

This is where they gain their permission from :

so simple chmod 1 will give execute only permision on file/folder

so simple chmod 2 will give write only permision on file/folder

so simple chmod 3 will write & execute permision on file/folder

chmod 775 test.txt >> this mean 7 for 

UNIX Permissions

Value	Permission	Directory Listing
0	No read, no write, no execute	---
1	No read, no write, execute	--x
2	No read, write, no execute	-w-
3	No read, write, execute	-wx
4	Read, no write, no execute	r--
5	Read, no write, execute	r-x
6	Read, write, no execute	rw-
7	Read, write, execute	rwx