Unix Permissions and values

Change UNIX permissions by using the simple command.


Syntax:


chmod 775 filename or foldername


Example:



chmod 775 test.txt


In the above cmd we are changing the permission of test file to 775 (Read/Write/Execute).


Below is the table of permissions.



UNIX Permissions:














Value
Permission
Directory Listing
0
No read, no write, no execute
---
1
No read, no write, execute
--x
2
No read, write, no execute
-w-
3
No read, write, execute
-wx
4
Read, no write, no execute
r--
5
Read, no write, execute
r-x
6
Read, write, no execute
rw-
7
Read, write, execute
rwx

rwx rwx rwx = 111 111 111
rw- rw- rw- = 110 110 110
rwx --- --- = 111 000 000

and so on...

rwx = 111 in binary = 7
rw- = 110 in binary = 6
r-x = 101 in binary = 5
r-- = 100 in binary = 4