Linux/Mac 

Unless your distribution provides a package for rustup, you'll need to install rustup by typing the following command in your terminal:

$ curl https://sh.rustup.rs -sSf | sh
info: downloading installer

Welcome to Rust!

[...]

Current installation options:

   default host triple: x86_64-unknown-linux-gnu
     default toolchain: stable
  modify PATH variable: yes

1) Proceed with installation (default)
2) Customize installation
3) Cancel installation

This downloaded rustup and asked you whether you want to customize the installation. Unless you have particular needs, you'll be okay with the default.

Note: The $ represents your shell prompt and should not be typed; you must type the text following it. Also, a line of text that doesn't start with $ represents the text output of the program.

To proceed with the installation, enter 1 and press Enter. This will install the rustc compiler, and the cargo package manager, among other things:

info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
info: latest update on 2017-07-20, rust version 1.19.0 (0ade33941 2017-07-17)
info: downloading component 'rustc'

[...]

  stable installed - rustc 1.19.0 (0ade33941 2017-07-17)


Rust is installed now. Great!

To get started you need Cargo's bin directory ($HOME/.cargo/bin) in your PATH
environment variable. Next time you log in this will be done automatically.

To configure your current shell run source $HOME/.cargo/env

As pointed out by the installer, you need to execute the following command in order to add the directory containing these tools in your PATH:

$ source $HOME/.cargo/env
# Which is the same as executing the following:
$ export PATH="$HOME/.cargo/bin:$PATH"

(This is only needed once because the rustup installer added it to your ~/.profile file.)

Now, test that you have both cargo and rustc, as you'll need them very soon:

$ cargo -V
cargo 0.23.0 (61fa02415 2017-11-22)
$ rustc -V
rustc 1.22.1 (05e2e1c41 2017-11-22)

Cargo is Rust's package manager and build tool: it allows you to compile and run your projects, as well as managing their dependencies.

At the time of writing this book, the stable Rust version was 1.22.0.