【rust】rust安装，运行第一个Rust 程序 （1）

安装 Rust

在 Unix 类系统如 Linux 和 macOS 上，打开终端并输入：

curl https://sh.rustup.rs -sSf | sh

回车后安装过程出现如下显示：

info: downloading installer

Welcome to Rust!

This will download and install the official compiler for the Rust programming
language, and its package manager, Cargo.

It will add the cargo, rustc, rustup and other commands to Cargo's bin
directory, located at:

  /root/.cargo/bin

This path will then be added to your PATH environment variable by modifying the
profile files located at:

  /root/.profile
  /root/.bash_profile

You can uninstall at any time with rustup self uninstall and these changes will
be reverted.

Current installation options:

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

) Proceed with installation (default)
) Customize installation
) Cancel installation

选择 1 ，回车继续；

这样会下载一个脚本并开始安装。如果一切顺利，你将会看到：

Current installation options:

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

) Proceed with installation (default)
) Customize installation
) Cancel installation
>

info: syncing channel updates for 'stable-x86_64-unknown-linux-gnu'
334.4 KiB / 334.4 KiB ( %) 191.0 KiB/s ETA:    s
info: latest update on --, rust version 1.34. (6c2484dc3 --)
info: downloading component 'rustc'
 85.3 MiB /  85.3 MiB ( %) 172.7 KiB/s ETA:    s
info: downloading component 'rust-std'
 56.1 MiB /  56.1 MiB ( %) 182.4 KiB/s ETA:    s
info: downloading component 'cargo'
  4.3 MiB /   4.3 MiB ( %) 188.8 KiB/s ETA:    s
info: downloading component 'rust-docs'
 10.2 MiB /  10.2 MiB ( %) 169.4 KiB/s ETA:    s
info: installing component 'rustc'
 85.3 MiB /  85.3 MiB ( %)  12.8 MiB/s ETA:    s
info: installing component 'rust-std'
 56.1 MiB /  56.1 MiB ( %)  13.3 MiB/s ETA:    s
info: installing component 'cargo'
info: installing component 'rust-docs'
 10.2 MiB /  10.2 MiB ( %)   1.2 MiB/s ETA:    s
info: default toolchain set to 'stable'

  stable installed - rustc 1.34. (6c2484dc3 --)

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

如上显示代表安装完成；

rust卸载

卸载 Rust 跟安装它一样容易：

rustup self uninstall

第一个Rust程序

依据惯例，打印hello,world

编辑创建文件main.rs

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

编译（类似于C语言的gcc编译）：

rustc  main.rs

运行：

./main

输出：

Hello, world!