Thanks for the links, I will definitely check them out.
I intuitively go to Terminal:
[serge@localhost serge]$ su
Password:
[root@localhost serge]# /boot/grub/grub.conf
bash: /boot/grub/grub.conf: Permission denied
[root@localhost serge]#
in the explorer (sorry

) the file icon has ghostbusters icon on it (red circle with diagonal line)
