now running mac os x 10.53 and sudo chmod comes back with : operation not permitted.
sample file:
-rwxr-xr-x+ 1 1000 com.apple.monitor_all_services 276592 Jun 8 2007 342345.tif
i am running as root.
I'm not familiar with Mac OS X, so maybe this is a stupid question, but what's the significance of the plus in the permissions "-rwxr-xr-x+"?
Also, check whether the partition is mounted read only. Some file systems also have attributes like "immutable" which prevent changes to existing files, outside of the regular chmod permissions.