CLI with Clap

Build CLI applications with clap derive API.

Difficulty

Intermediate

Code

use clap::Parser;

#[derive(Parser, Debug)]
#[command(name = "greet")]
struct Args {
    #[arg(short, long)]
    name: String,
    #[arg(short, long, default_value_t = 1)]
    count: u32,
}

fn main() {
    let args = Args::parse();
    for _ in 0..args.count {
        println!("Hello, {}!", args.name);
    }
}

Explanation

Clap derive API generates CLI parsing from structs.

Key Concepts

• Read the code carefully and understand the data flow
• Try modifying the example to see how it changes behavior
• Run this code in the Rust Playground

Related Topics

Browse more examples in the cli category to build a complete understanding of this topic.