UNIX Shell Programming

Start by understanding what shell scripts are and how they function. Learn how to create, edit and run scripts effectively. You’ll work with variables, environment settings and command substitution, developing a clear grasp of how to build flexible, efficient scripts. This module also introduces quoting rules, file naming conventions and output control – equipping you with scripting essentials that make automation possible.  

Learn to structure your scripts using logic that allows for intelligent decision-making and repetition. This section covers core control flow tools such as ‘if’ statements, ‘case’ statements, and loop constructs including ‘for’, ‘while’, and ‘until’. You’ll gain experience using these features to build scripts that respond to different scenarios and system states, enabling more flexible automation and making your scripts more powerful and adaptable to changing needs.  

Take your scripting skills further by building interactive and user-friendly scripts. You’ll learn how to capture user input using the ‘read’ command, process command-line arguments, and use selection logic through ‘case’ and ‘select’ statements. The focus is on creating clear, structured menus and prompts that guide users through scripted tasks. These techniques are particularly useful for creating repeatable internal tools that simplify regular operations and support less technical users in performing IT functions.  

Strengthen your scripting capabilities with advanced tools that boost script efficiency and reliability. You’ll work with AWK to manipulate text streams, write your own modular functions for reuse across scripts, and handle system events using traps. These skills help you build scripts that are not only functional but also easier to maintain and extend. You’ll also learn how to incorporate best practices for script design, error management, and performance optimisation in complex environments.