Understanding Group Permissions
Solution 1:
A file can only have one group
-
Only the owner of the file can do that.
$ sudo touch ~/tmp/test $ sudo chown root:aboettger ~/tmp/test $ ls -la ~/tmp/test -rw-rw-r-- 1 root aboettger 853 Jun 19 08:26 /home/aboettger/tmp/test $ chmod g-w ~/tmp/test chmod: changing permissions of 'test': Operation not permitted You have
rwxaccess rights
And you should read this. ;)