Introduction to Rust

Introduction to Rust


Rust is a multi-paradigm, general-purpose programming language emphasizing performance, type safety, and concurrency. It is a language for systems programming developed by the Mozilla Foundation. The Rust language makes you a simple promise: if your program passes the compiler's checks, it is free of undefined behavior. It consists of 3 main components:

  1. cargo is Rust's compilation manager, package manager and general-purpose tool. You can use Cargo to start a new project, build and run your program, and manage any external libraries your code depends on.
  2. rustc is the Rust compiler. Usually we let Cargo invoke the compiler for us, but sometimes it's useful to run it directly.
  3. rustdoc is the Rust documentation tool. If you write documentation in comments of the appropriate form in your program's source code, rustdoc can build nicely formatted HTML from them. Like rustc, we usually let Cargo run rustdoc for us.


Official installation way:

curl --proto '=https' --tlsv1.2 -sSf | sh

But I got error, maybe because of KDE Neon:

info: downloading installer
curl: (6) Could not resolve host:
rustup: command failed: downloader /tmp/tmp.ZijlkwgHu3/rustup-init x86_64-unknown-linux-gnu

So I used Ubuntu packages to install Rust by running:

sudo apt update
sudo apt install rustc cargo

To check that Rust got installed:

rustc --version

rustc 1.43.0

You can also install additional development tools like Rust Analyzer and rust-src:

mkdir -p ~/.local/bin
curl -L | gunzip -c - > ~/.local/bin/rust-analyzer
chmod +x ~/.local/bin/rust-analyzer

sudo apt install rust-src

Hello World in Rust

Let's first create a simple hello world program:

mkdir hello_world
cd hello_world

And create a file called with the following content:

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

And to compile and test run:


Hello, world!


To create a new project:

cargo new superproject

To build and run:

cargo build
cargo run

To clean generated files:

cargo clean