To compile and run C# code on Linux, a popular open-source implementation of the .NET framework is Mono. It’s compatible with most Linux distributions, such as Ubuntu, Debian, Fedora, Arch Linux, etc.

Since I’m running Fedora on my laptop, I would install Mono with the following command:

$ sudo dnf install mono-devel

There are more installation instructions on their website, but I bet it’s already packaged and available in most distributions’ repositories.

Now, we will create a directory where we can do our testing:

$ mkdir /tmp/csharp
$ cd /tmp/csharp

Next, it’s time for creating a hello world program:

% echo '''using System;

public class HelloWorld
    static public void Main()
        Console.WriteLine("Hello Mono World");
}''' > hello.cs

Compile and run the program with the following two commands:

$ mcs hello.cs
$ mono hello.exe
Hello Mono World

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