A key tenet of Linux is the ability to allow multiple users to access the system while performing independent tasks simultaneously. The smooth operation of this multiuser, multitasking environment is controlled via permissions. The Linux kernel provides a robust framework for the underlying security and isolation model. At the user level, dedicated tools and command-line utilities help Linux users and system administrators with the related permission management tasks.
For some Linux users, especially beginners, Linux permissions may appear confusing at times. This section attempts to demystify some of the key concepts about file and directory permissions in Linux. You will learn about the basic permission rights of accessing files and directories—the read, write, and execute permissions. We explore some of the essential administrative tasks for viewing and changing permissions, using system-level command-line utilities.
Most of the topics discussed...