Chmod codes cheat sheet

How to use chmod codes in unix:

There is three types of permisions in files and folders in unix 1.1. Read (r) 1.2. Write (w) 1.3. Execute (x)
And, there is a clasificacion of users called UGO (explained bellow): 2.1. U ~> User (usually, you) 2.2. G ~> Group (eg sudo group) 2.3 O ~> Others

When you run $ ls -l your output will be something like this:

-rwxrwxrwx@  1 user  staff  708301983 Aug 11 13:51 all.zip
-rw-r--r--   1 user  staff          0 Aug 22 22:10 chmodCheatSheet.md
-r--------@  1 user  admin       1692 Jul  6 10:13 deploykey.pem
drwxr-xr-x   3 user  staff        102 Aug 20 19:14 deploynode

How to read this?

Take the first output:

U	G	O
r w x	r w x	r w x
1 1 1	1 1 1	1 1 1

So, user, group and others can read, write and excute the file or folder

Take the second output:

U	G	O
r w -	r --	r - x
1 1 0	1 0 0	1 0 1

So, user can read and write, group and other only can read.

As you can see, we can play with these permisions

U	G	O
r - x	r w -	- - -
1 0 1	1 1 0	0 0 0
- w x	r - x	- - x
0 1 1	1 0 1	0 0 1

Finally, the codes! (sorry)

Bin	Decimal	Representation
000	0	- - -
001	1	- - x
010	2	- w -
011	3	- w x
100	4	r - -
101	5	r - x
110	6	r w -
111	7	r w x

So, if I run $ chmod 777 file <=> rwx rwx rwx everybody can do anything with this file or folder!
Or I run $ chmod 744 <=> rwx r-- r--only user can read, write and execute, group and others only read.
Or run $ chmod 200 <=> -w- --- ---only you can write this file or folder

Thanks for reading, I hope it works! Follow me on Twita and GitHub

Refs:

GitOffMyCode/chmodCheatSheet.md

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