Введение в книгу : Shell scripting is a quick method to prototype complex applications or problems. Shell scripts are a collection of commands to automate tasks, usually those for which the user has a repeated need, when working on Linux-based systems. Using simple commands or a combination of them in a shell can solve complex problems easily.
Write effective shell scripts easily
Perform search operations and manipulate large text data with a single shell command
Modularize reusable shell scripts by creating shell libraries
Redirect input, output, and errors of a command or script execution to other streams
Debug code with different shell debugging techniques to make your scripts bugfree
Manage processes, along with the environment variables needed to execute them properly
Execute and embed other languages in your scripts
Manage creation, deletion, and search operations in files