Module.111: Advanced Shell Scripting using Bash

Introduction

Hello and welcome to Level 2: Advanced Shell Scripting with Bash. This advanced course is made for trainees who have already grasped the fundamentals and aims to turn them into true system automation specialists. Moving away from the standard loop and conditional statements, we will explore production-level scripting problems. Students will become proficient in working with `sed`, `awk`, and regular expressions to process text efficiently. In addition, the course covers error handling techniques, interactions with APIs by using `curl` and `jq`, managing background processes and remote execution by using SSH. At the completion of this course, trainees will be able to develop command-line applications.

Salient features of Training Program:

Live and Interactive Format: 15 live online sessions, specifically structured with 20 minutes of core concepts, 30 minutes of hands-on coding, and 10 minutes of dedicated Q&A.

Advanced Text Processing: Moves beyond basic grep to master production-grade text manipulation and data extraction using standard tools like awk, sed, and Extended Regular Expressions (ERE).

Professional CLI Design: Teaches trainees how to build standard, user-friendly command-line interfaces using getopts for flag parsing and tools like whiptail for terminal-based graphical menus.

API and Cloud Integration: Equips trainees with the modern skills needed to interact with REST APIs, make HTTP requests using curl, and parse JSON payloads natively in Bash using jq.

Bulletproof Error Handling: Focuses on writing resilient scripts by utilizing strict environment settings (set -e, set -u, pipefail) and custom error-logging functions.

Process and Signal Management: Covers advanced execution control, including background job management, parallel processing with wait, and graceful script terminations using trap.

Remote Server Automation: Prepares trainees for real-world DevOps environments by teaching remote script execution and secure file transfers using SSH, scp, and rsync.

Secure Coding Practices: Emphasizes script security by teaching safe temporary file creation (mktemp), quoting best practices, avoiding dangerous commands like eval, and linting with ShellCheck.

Bulk File Operations: Addresses common sysadmin bottlenecks by mastering safe and efficient batch processing using advanced find predicates combined with xargs.

Seamless Skill Progression: Purposely designed as a Level 2 bridge, picking up exactly where introductory courses leave off to transform basic scripting knowledge into advanced system administration capabilities.

Course Duration:

→ 15 Hours/Sessions of 1 hour each.

Training Methodology:

→ Online Live Sessions of 1 hour each

→ 1 session each on saturdays and sundays

→ Hands on approach to training, behaviorial model of training would be practiced.

→ A discussion forum would be provided for queries and discussion.

Prerequisites:

→ Proficiency in basic Bash scripting

→ The trainee must have already completed this module...

Shell Scripting using Bash...

Target Audience:

→ Software developers, system administrators, DevOps engineers, and IT professionals seeking to advance their scripting skills in Bash.

Course Content...

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Course Deliverables:

→ Comprehensive study materials and script examples

→ Access to a repository of advanced Bash libraries and tools

→ Lifetime access to discussion forum

→ Certificate of Completion

after the training is over, trainee should be able to ...

After successfully completing this Level 2 advanced training program, the trainee will be able to:

Customize Bash Environments: Confidently manage and configure Bash startup files (.bashrc, .bash_profile) and control script execution environments.

Formulate Complex Regular Expressions: Write robust Extended Regular Expressions (ERE) to accurately match, filter, and extract specific text patterns from large datasets.

Automate Text Manipulation: Use sed to perform complex, in-place text substitutions and multi-line edits across hundreds of configuration files simultaneously.

Generate Data Reports: Leverage awk to parse structured data (like server logs or CSVs) and generate clean, formatted analytical reports natively in the terminal.

Control Advanced Data Streams: Route data efficiently using custom file descriptors, Here Documents, and process substitution instead of relying on slow, disk-heavy temporary files.

Manage Concurrent Processes: Execute and monitor background jobs in parallel, significantly reducing the total execution time for heavy administrative tasks.

Implement Graceful Exits: Use trap to catch system signals (like Ctrl+C) so scripts fail cleanly and automatically delete their own temporary files.

Write Bulletproof Code: Enforce strict error handling using set -e, set -u, and pipefail to prevent scripts from running destructively when an unexpected error occurs.

Optimize Variable Scoping: Prevent variable leakage and unexpected behavior by mastering variable scope (local), environment inheritance, and subshells.

Automate REST API Interactions: Make HTTP requests to modern web services using curl and parse complex JSON payloads effortlessly using jq.

Design Interactive Menus: Build user-friendly, interactive terminal applications featuring selection menus and graphical dialog boxes to assist non-technical users.

Secure Script Execution: Audit and secure their code against common vulnerabilities (like improper quoting and eval injection) using tools like ShellCheck.

Build Professional CLI Tools: Use getopts to create scripts that accept standard UNIX-style flags (e.g., -v, -f filename) rather than relying on strict, positional arguments.

Process Bulk Files Safely: Batch-process thousands of files safely—even those with spaces or special characters in their names—using advanced find predicates and xargs.

Execute Remote Automation: Manage multi-server fleets by automating remote script execution and synchronizing data securely using SSH, scp, and rsync.