Overview

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This course focuses on advanced shell scripting techniques with an emphasis on security, portability, and debugging. These skills are essential for creating reliable, maintainable scripts in professional Unix-like environments. Learners will develop expertise in auditing and securing scripts, ensuring compatibility across different shell environments, and troubleshooting complex scripting issues. The course also introduces Z Shell scripting, expanding adaptability and command-line proficiency. The course blends detailed explanations, real-world examples, and scenario-based quizzes to reinforce learning. It emphasizes applied problem-solving, allowing participants to address security and portability challenges directly in their scripting practice. IT professionals, system administrators, and advanced Linux users will benefit most from this course. A foundational understanding of Linux shell scripting is recommended to fully leverage the content. Packt is one of the world's most prolific publishers of cutting-edge technical content. For over two decades we've made it our mission to curate and publish the knowledge of only the very best technical experts. We focus on real-world courses that help our customers get the job done, with coverage that extends across a wide range of established and cutting-edge technical topics. If you're an individual or an organisation that embraces learning by doing, Packt is the perfect fit for you. This course is part three of a three-course Specialization designed to provide a comprehensive learning pathway in this subject area. While it delivers standalone value and practical skills, learners seeking a more integrated and in-depth progression may benefit from completing the full Specialization.

Syllabus

Shell Scripting for Security Professionals
- This module demonstrates how to leverage shell scripting to automate essential security tasks, such as auditing user accounts, scanning network ports, monitoring user activity, and configuring basic firewalls. Learners will adapt existing scripting knowledge to real-world security scenarios across different Unix-like systems.
Shell Script Portability
- This module guides learners through the principles and practices of writing portable shell scripts, focusing on POSIX compliance, differences between common shells, and common pitfalls such as array handling and echo command inconsistencies. Learners will also explore tools like ShellCheck and checkbashisms to test and validate script compatibility across Unix and Linux environments. Practical labs and examples reinforce best practices for ensuring scripts run reliably on diverse systems.
Shell Script Security
- This module explores essential security practices for shell scripting, including managing permissions, handling sensitive data, and preventing vulnerabilities such as command injection. Learners will gain hands-on experience with ACLs, SUID/SGID settings, secure temporary file creation, and the safe use of commands like eval. Practical labs reinforce how to implement and test security measures across different Unix-like systems.
Debugging Shell Scripts
- This module guides learners through the process of diagnosing and fixing common errors in shell scripts. You will explore essential debugging tools like xtrace and bashdb, and learn best practices for managing variables and loop constructs to prevent and resolve scripting issues.
Introduction to Z Shell Scripting
- This module introduces learners to Z Shell (zsh) scripting, highlighting its installation, unique features such as variable expansion, math operations, and array handling. Learners will compare zsh with Bash, explore directory expansion techniques, and discover useful zsh modules for automation tasks.