Book Image

Fundamentals of Linux

By : Oliver Pelz
Book Image

Fundamentals of Linux

By: Oliver Pelz

Overview of this book

Linux is a Unix-like operating system assembled under the model of free and open source software development and distribution. Fundamentals of Linux will help you learn all the essentials of the Linux command line required to get you started. The book will start by teaching you how to work with virtualization software and install CentOS 7 Linux as a VM. Then, you will get to grips with the workings of various command line operations, such as cursor movement, commands, options, and arguments. As you make your way through the chapters, the book will not only focus on the most essential Linux commands but also give an introduction to Bash shell scripting. Finally, you will explore advanced topics, such as networking and troubleshooting your system, and you will get familiar with the advanced file permissions: ACL, setuid, and setgid. Fundamentals of Linux includes real-world tasks, use cases, and problems that, as a system administrator, you might encounter in your day-to-day activities.
Table of Contents (7 chapters)

setuid, setgid and sticky bit

In this section, we will show you everything you need to know about the special file permission flags, setid, setgid, and the sticky bit.


Now let's talk about setuid, setgid, and the sticky bit. As we work with users, groups, and file permissions, let's first log in as root.

First, let's create a new user, group, and the copy of the whoami command locally to see what's going on with the setuid flag:

Next, let's change the file owner and group owner of this command to awesome_user and awesome_group:

Setting the setuid, setgid, and the sticky bit can also be done using octal notations. You already know about them from the file permissions chapter. These special...