Read/write files in Rust

files.rs

// https://stackoverflow.com/a/31193386
use std::fs;
use std::io;

fn main() -> Result<(), io::Error> {
    // Read a file to a String
    let data = fs::read_to_string("/etc/hosts")?;
    println!("{}", data);
    
    // Read a file as a Vec<u8>
    let data = fs::read("/etc/hosts")?;
    println!("{}", data.len());
    
    // Write a file
    let data = "Some data!";
    fs::write("/tmp/foo", data)?;
    
    Ok(())
}