Rust by Example

Standard Library

The command line arguments can be accessed using std::env::args, which returns an iterator that yields a String for each argument:

use std::env;

fn main() {

let args: Vec = env::args().collect();

// The first argument is the path that was used to call the program.

println!("My path is {}.", args[0]);

// The rest of the arguments are the passed command line parameters.

// Call the program like this:

//   $ ./args arg1 arg2

println!("I got {:?} arguments: {:?}.", args.len() - 1, &args[1..]);

}

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$ ./args 1 2 3

My path is ./args.

I got 3 arguments: ["1", "2", "3"].

Crates

Alternatively, there are numerous crates that can provide extra functionality when creating command-line applications. The Rust Cookbook exhibits best practices on how to use one of the more popular command line argument crates, clap.