Command Line Arguments

Parse command line arguments with std::env.

Difficulty

Beginner

Code

use std::env;

fn main() {
    let args: Vec<String> = env::args().collect();
    println!("program: {}", args[0]);
    println!("args: {:?}", &args[1..]);

    if args.len() > 1 {
        println!("first arg: {}", args[1]);
    }
}

Explanation

This example demonstrates how to use command line arguments in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

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