1. In the bin folder, create a file called cli_params.rs

2. Add the following code and run it with cargo run --bin cli_params some_option some_other_option:

1   use std::env;
2
3   fn main() {
4     // env::args returns an iterator over the parameters
5     println!("Got following parameters: ");
6     for arg in env::args() {
7       println!("- {}", arg);
8     }
9
10    // We can access specific parameters using the iterator API
11    let mut args = env::args();
12    if let Some(arg) = args.nth(0) {
13      println!("The path to this program is: {}", arg);
14    }
15    if let Some(arg) = args.nth(1) {
16        println!("The first parameter is: {}", arg);
17    }
18    if let Some(arg) = args.nth(2) {
19        println!("The second parameter is: {}", arg);
20    }
21
22    // Or as a vector
23    let args: Vec<_> = env::args().collect();
24    println!("The path to this program is: {}", args[0]);
25    if args.len() > 1 {
26        println!("The first parameter is: {}", args[1]);
27    }
28    if args.len() > 2 {
29        println!("The second parameter is: {}", args[2]);
30    }
31  }