linux file-system The Linux Environment MOC
Each file and folder is owned by a user and a group. -rw-r--r-- 1 corban www-data 20 Sep 26 09:58 permissions_example has user “corban” and group “www-data”
There are three permission modes:
- r: Read
- w: Write
- x: Execute
The first part of -rwxrw-r-- 1 corban www-data 20 Sep 26 09:58 permissions_example shows the permissions in directory(1)-user(3)-group(3)-others(3). So, permissions_example is not a directory, the user (“corban”) can read, write, and execute, the group (“www-data”) can read and write, and everyone else can only read it.
Setting File Permissions
Change owner
chown <new_owner> <file> “changes owner” to new_owner for file
chgrp <new_group> <file> “changes group ” to new_group for file
Change permissions
chmod <num> <file> changes permissions for file according to num where num is a 3 digit number calculated from Read = 4, Write = 2, and Execute = 1 per category
Ex. 512 = r-x--x-w-