How to Use std

:env for Environment Interaction

Stdlib

2026-04-17T12:05:42+00:00

Read environment variables with std::env::var and command-line arguments with std::env::args in Rust.

Use std::env::var to read a specific environment variable or std::env::args to access command-line arguments passed to your program.

use std::env;

fn main() {
    if let Ok(val) = env::var("MY_VAR") {
        println!("Value: {val}");
    }
    
    let args: Vec<String> = env::args().collect();
    println!("Args: {args:?}");
}