From Bash to Go: A Practical Guide to Building CLI Tools

This article is the second part of a series introducing Bash programmers to Go, focusing on building command-line tools. Starting with a simple "hello world" example, it progressively covers writing tests, handling input/output, using the io.Writer interface, avoiding global variable pitfalls, and leveraging option patterns and the `flag` package to handle command-line arguments and flags. The article culminates in a more practical CLI tool: counting duplicate lines in input text.