Shell scripts have helped system administrators and programmers automate routine tasks since the dawn of computers. Much has changed since the first edition of this book was published in 2004, but the bash shell has only strengthened its leadership position. Therefore, the ability to use all its capabilities becomes an urgent need for system administrators, engineers and enthusiasts. This book describes common problems that you may encounter, for example, when assembling software or coordinating the actions of other programs. And the solutions are presented in such a way that they can easily be taken as a basis and extrapolated to other similar problems. The purpose of this book is to demonstrate practical techniques for programming bash scripts and introduce the most common utilities through short and compact examples, without going into unnecessary detail. Experiment with these scripts - break them, fix them, and adapt them to your needs to understand how they work. This is the only way you can solve the most complex problems.