setuid bit doesn't do the trick!!!

[john77eipe]

Thanks. That explains everything.

[john77eipe]

It seems it works on both executables and non-executables. I believe if setuid bit is set, then the file he is executing or opening to write should give him full privileges as that of the process.

My bad! I didn't make any sense (above).

It is true that the Linux kernel ignores the setuid and setgid bits on shell scripts. These bits work only on binary (compiled) executables.