File Permissions

Create Groups

• use groupadd groupname

Add user to group

• Use usermod -g groupname username to change the primary group
• Use usermod -a -G groupname username to add to the group

Change directory group

• Use chgrp groupname /directory to change the group of a directory.

Change permission

• Change group permissions with chmod g+-rwx file/directory
• Change everyone's permissions with chmod o+-rwx file/directory