Make a file not overwriteable
 

Hi, I don't know why, whenever I "touched" my admin network options, it tries to overwrite my /etc/resolve.conf file, and this causes me not able to connect to the www properly. I have to take some time to figure out this problem when it occurs and I have to login as root to edit the file. I wish to make the file not overwriteable. I already chmod the file to 444 only, but it seems still to be able to be overwrited, the system seems to have the power of root. I wonder if I could "fix" the file somehow so that the system can't modify it.
Thanks,
Ted

sudo chmod 0000 /path/to/file ?

will set the immutable flag for the file in question. For more info on chattr have a look at

Set the file to be immutable.

To disable it just
edit: ah tobi beat me to it :)

Thanks!

I use
on front cover images of albums. Since I keep the front cover images in the same directory as the mp3 files making the image immutable helps me avoid mistakes like
in which case the poor image would have undesirable id3 tag information were it not immutable. That's just one example. And my 2 cents worth. :)