GOGOLINUX

Chmod is the option for us to make file or folder have privilage status.
Standard form of chmod is:

$ chmod 421

The first digit : the file / folder is for user.
The second digit : file / folder is for group.
The third: universal user.

The amount of the number, has meanings:
4 >> Allow Read
2 >> Allow Write
1 >> Allow Execute

It is a standar number of chmod. If you meet 7,6,5,3, it must amount of standar number.
7 = 4 + 2 + 1
6 = 4 + 2
5 = 4 + 1
3 = 2 + 1

notes:
.. parent

elshadino act

0 = Nothing
1 = Execute
2 = Write
3 = Execute & Write (2 + 1)
4 = Read
5 = Execute & Read (4 + 1)
6 = Read & Write (4 + 2)
7 = Execute & Read & Write (4 + 2 + 1)

elshadino act