Zsh CLI Tutorial — getopts, Colors, Progress Bars & Todo App #26

Learn how to build professional command-line tools in Zsh! This lesson covers argument parsing with getopts, colored output with ANSI codes, spinners and progress bars, plus a complete todo CLI app with subcommands. 🔗 Source code: https://github.com/GoCelesteAI/zsh_building_cli_tool ⏱️ Timestamps: 0:00 — Intro 0:26 — CLI Foundations Explained 1:11 — CLI Foundations Demo 3:37 — CLI Polish Explained 4:22 — CLI Polish Demo 7:10 — Complete CLI App Explained 7:55 — Complete CLI App Demo 11:10 — Recap 11:52 — End 📋 Topics covered: • getopts: parse -v, -n value, -h flags in a while loop • OPTARG: access the value passed to a flag • OPTIND + shift: access positional arguments after flags • usage() function: document your tool with a help message • Exit codes: 0 for success, 1 for errors, 2 for usage errors • ANSI escape codes: \e[32m green, \e[31m red, \e[33m yellow, \e[0m reset • Color helpers: success(), error(), warn(), info() functions • Spinner animation: \r overwrite with |/-\ characters • Progress bar: [####....] with printf formatting • Interactive prompts: read "response?prompt" for user input • Subcommand routing: case "$1" in add|list|done|remove • File-backed storage: plain text with sed for in-place edits • Complete todo CLI: add, list, done, remove subcommands 🎬 Part of the Zsh Shell Tutorial series — subscribe for weekly lessons!