i have redhat 5.2 installed , and i recently wanted to try play a audio cd that i have .. i tried with root and it played normally .. but when i used the account owner ... it said i had no permission to the cdrom or the cdrom wasn't compiled with the kernel ( which wasn't the case ) . so i did a chmod 4755 /dev/cdrom .. is that safe ? what does that 4 in the beginning mean ? is there a chmod 5755 ? what'll that mean ? is there any better way of doing it ? ps .. i did a chmod 4755 on all files that are need by pppd , so that i could connect to the internet with a non-root user .. is that ok ?
