a) How do octal access control codes work?


b) How do you set access controls with command line options instead of octal codes?

What are you working with?
Try this:
Ascii Table - ASCII character codes and html, octal, hex and decimal chart conversion (http://www.asciitable.com/)

Strat, this question is a follow-up to Unix controls (https://www.askmehelpdesk.com/other-programming/unix-controls-403665.html).


How do octal access control codes work?

The Wikipedia article I referenced in Unix controls (https://www.askmehelpdesk.com/other-programming/unix-controls-403665.html) covers this. What isn't clear?


How do you set access controls with command line options instead of octal codes?

See the chmod command man page (http://www.manpagez.com/man/1/chmod/) or the man page on your system, particularly the parts regarding specifying the parameters of the command using symbolic mode. Only root or the file's owner can make changes. Example: chmod u=rwx MyFile.