Linux File Permissions - Harrison-Blair/SYS-255 GitHub Wiki

Add a Group : groupadd "groupname"

Assign user to a Group : usermod -aG "group_name" "user"

Assign a Group to a directory/file : chgrp "group_name" "directory/file"

Change the rwe permissions on a file : chmod -v ugo "directory/file"

• [u]ser: rwe
• [g]roup: rwe
• [o]ther: rwe

Summation Formula

• read 100 4
• write 010 2
• execute 001 1