use std::process::Command;
use std::RealTime;
use std::println;
fn main(){
let time= RealTime::now();
let output = Command::new("ls")
.output()
.expect("Failed to execute command");
let elapsed = time.elapsed();
std::println("Command output: {}", String::from_utf8_lossy(&output.stdout));
std::println("Execution time: {:?}", elapsed);
}