Use External Process STDIN And STDOUT Pipes In Rust

#!/usr/bin/env cargo +nightly -Zscript

//! ```cargo
//! [package]
//! edition = "2021"
//! [dependencies]
//! ```

use std::io::Write;
use std::process::{Command, Stdio};

fn main() {
    let mut child = Command::new("cat")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .spawn()
        .expect("Failed to spawn child process");
    let mut stdin = child.stdin.take().expect("Failed to open stdin");
    std::thread::spawn(move || {
        stdin
            .write_all("Hello, world!".as_bytes())
            .expect("Failed to write to stdin");
    });
    let output = child.wait_with_output().expect("Failed to read stdout");
    dbg!(output);
}