CLI Configuration Skill

Patterns and best practices for managing configuration in command-line applications.

Configuration Precedence

The standard precedence order (lowest to highest priority):

1. Compiled defaults - Hard-coded sensible defaults
2. System config - /etc/myapp/config.toml
3. User config - ~/.config/myapp/config.toml
4. Project config - ./myapp.toml or ./.myapp.toml
5. Environment variables - MYAPP_KEY=value
6. CLI arguments - --key value (highest priority)

use config::{Config as ConfigBuilder, Environment, File};