https://mksiva.com/tags/command-line/ Recent content in Command Line on Siva Kalidasan Hugo en-us Sat, 20 Jun 2026 00:00:00 +0000 https://mksiva.com/tech/building-a-simple-cli-with-picocli/ Sat, 20 Jun 2026 00:00:00 +0000 https://mksiva.com/tech/building-a-simple-cli-with-picocli/ <p><em>Picocli is a small Java library that makes it easy to build command-line tools. You write plain Java classes, add a few annotations, and Picocli handles parsing, help text, and error messages for you.</em></p> <h2 id="why-build-a-cli-tool">Why build a CLI tool?</h2> <p>Many useful tools run in the terminal:</p> <ul> <li>Build scripts</li> <li>Data migration utilities</li> <li>Dev helpers (rename files, check configs, seed databases)</li> <li>Internal admin tools</li> </ul> <p>You <em>can</em> parse <code>args</code> manually with <code>String[] args</code>, but that gets messy quickly when you need flags, subcommands, defaults, and <code>--help</code>.</p>