Signals are used for communication between processes. If you start a new process, how can you communicate with it through your shell or any other program or process while it is running? Also, how does the parent process know when the child process is finishing? For example, how does your Bash know when the ls -al command is terminating? In Linux, this kind of notification and interprocess communication is done using signals. In Linux, if a process starts another process, the parent process is put to sleep until the child process command has finished, which will trigger a special signal and this will wake up the parent process. The parent process is put to sleep so that no active CPU time is needed for waiting. A popular signal is the seek or interrupt signal, which will be sent to the running process each time we press Ctrl + C in an active program. This will interrupt...
Fundamentals of Linux
By :
Fundamentals of Linux
By:
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)
Preface
Free Chapter
Introduction to Linux
The Linux Command Line
The Linux Filesystem
Working with the Command Line
More Advanced Command Lines and Concepts
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