The Evolution of a Bash Tool: Comparing 3 Levels of Log Analysers

Log analysis is a bread and butter task for any DevOps engineer or SysAdmin. While there are massive enterprise tools for this, sometimes a quick Bash script is all you need. In this post, I’ll be comparing three versions of a Bash based Log Analyser I've been working on, showing the transition from a "beginner" script to a "professional grade" CLI tool. 🚀 The Three Contenders We have three distinct projects in the repository: log_analyser_simple : The "Keep It Simple, Stupid" (KISS) approach. log_analyser_scrpt : The "Professional" upgrade with flags and colors. log_analyser_adv : The "Advanced" version with robust validation and modularity. 1. log_analyser_simple : The Bare Essentials This version is perfect for anyone just starting with Bash. It focuses purely on the logic of parsing a file without the "bells and whistles" of a CLI. Logic: Uses a simple for loop over hardcoded levels ( ERROR , WARNING , INFO ). Argument Handling: Uses positional parameters ( $1 ). Key Feature: Ident