Solved

Linux Permissions - What does Octal mean?  N00b

Posted on 2011-03-15
402 Views

I grasp the idea of read / write / execute

Its split into 3 groups after the D for directory.  Owner Group and Others.

Octal?

0
Question by:fcek
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points

LVL 83

Assisted Solution

Dave Baldwin earned 100 total points
ID: 35142934
This http://en.wikipedia.org/wiki/Filesystem_permissions  should tell you all about it.
0

LVL 31

Accepted Solution

farzanj earned 400 total points
ID: 35142937
Octal means base 8 number : 0 through 7, then the next number is 10

This is how it works.  Say 1 means yes, 0 means no.
If you want
Write      0     no
Execute  1    yes

Then you have 101 which in octal is number 5
If you say yes to read, write and execute
Then you have 111  --- which is 7

Also, it goes by users, groups, others.

So first octal digit is for users, the second digit for groups and last for others

Octal would only mean that a digit would never exceed 7.
0

Author Comment

ID: 35143146

Ok the penny is beginning to drop as they say.

0

LVL 78

Expert Comment

ID: 35143159
Octal deals with the base of all numbers similar to the decimal system
0  1    2
1 10 100
Octal is base 8
1  8  64

However, Octal numbers like their HEX brotheren, can be represented by 0's and 1's in the base-2
three digits on base 2 represents an octal digit
1 2 4

four digit on base 2 represents a HEX digit
1 2 4 8

Execute has a 0 or 1 value
Write has a 2 or 0 value
Read has a 4 or 0 value
In octal it is represented as:

0

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

How to change the nameserver on Ubuntu Server 6 97
what do I need to host my own web sites? 13 85
How many users could squid support? 21 58
sed replace command 12 26
How many times have you wanted to quickly do the same thing to a list but found yourself typing it again and again? I first figured out a small time saver with the up arrow to recall the last command but that can only get you so far if you have a bi…
SSH (Secure Shell) - Tips and Tricks As you all know SSH(Secure Shell) is a network protocol, which we use to access/transfer files securely between two networked devices. SSH was actually designed as a replacement for insecure protocols that sen…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
Suggested Courses
Course of the Month7 days, 6 hours left to enroll