Welcome beginner to this bravefull journey. You’ve started learning Rust and as any other programming language you have to start with hello world!

Simple way

You’ll have to create a file. We will called it hello_world.rs:

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touch hello_world.rs

Next we will write our first Rust script. To run a Rust script, everything must be inside the main function:

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fn main() {
    println!("Hello world");
}

And that’s it, we’ve created our first Rust script. To run it we will have to compile it first and then execute it. To do so, run:

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rustc hello_world.rs \ # This will generate a binary called hello_world
./hello_world             # This will run the binary

The right way

We, rustians, create packages with cargo. Cargo is a powerful tool you’ll use compile, build, check and more stuff that will make your life easier. First, we create a new Rust project:

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cargo new hello_cargo --bin

This will create a new folder called hello_cargo. Inside we will found several files and folder, but we will just ignore it this time. Next we will go to src/ directory. There we should see a script called main.rs. You should see that this script already has a hello world script:

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fn main() {
    println!("Hello, world!");
}

We will run the following command to build and run our code:

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cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.00s
     Running `debug/hello_cargo`