Chapter 14. File Permissions and System Security
Jesper Pedersen and Steve “Mor” Moritsugu
Tip for Beginners
If you are planning to share files or programs with any other user on UNIX, you need to understand file and directory permissions as covered in this chapter. Beginners should not stay in the root account and should not change the owner, group, or permissions of any system files because a mistake in this area can crash or corrupt your whole system.