Mahmood N <[log in to unmask]> writes:

> [root@N100 mahmood]# groups mahmood
> mahmood : devs mahmood
> [root@N100 mahmood]# groups devs
> plotfi : devs
>
> [mahmood@N100 ~]$ ls /home/devs/tools
> ls: cannot access /home/devs/tools: Permission denied

Besides Jon's response, keep in mind that recent changes to the
/etc/group file does not affect any currently running shells.  Typing
simply "groups" in your "mahmood@N100" shell would confirm if that
instance picked up the change or not.  If the change wasn't picked up,
log out that account and log back in.

-Brett.