Hi!

I am in the process of learning file permissions for the Linux+ Certification. Specifically, I am looking at the numerical notation for file permissions. A thought occurred to me as to why the numbers 1-7 represent what they do.

I'll bet you have already explained this concept somewhere in your videos but here it is:

0 - None

1 - Execute

2 - Write

3 - Write and Execute

4 - Read

5 - Read and Execute

6 - Read and Write

7 - Read, Write and Execute

Here are the values that you mentioned for numerical notation. Are these numbers in 3 binary sets?

ie.

6 - read and write

110 ( which is 6 in Binary)

4 - read

100

Does it make sense to think of the numeric file permissions in the form of binary numbers in which each value represents (read, write, execute) --> (111)?

Thank you!