Linux File Permissions Reference

file_perms.txt

- Found this on http://www.december.com/unix/ref/chmod.html -

File permissions
Use the chmod command to set file permissions.
The chmod command uses a three-digit code as an argument.

The three digits of the chmod code set permissions for these groups in this order:

Owner (you)
Group (a group of other users that you set up)
World (anyone else browsing around on the file system)

Each digit of this code sets permissions for one of these groups as follows. Read is 4. Write is 2. Execute is 1.

The sums of these numbers give combinations of these permissions:

0 = no permissions whatsoever; this person cannot read, write, or execute the file
1 = execute only
2 = write only
3 = write and execute (1+2)
4 = read only
5 = read and execute (4+1)
6 = read and write (4+2)
7 = read and write and execute (4+2+1)