ScriptCS script that extracts all unique file extensions from a directory

ExtractAllExtensions.csx

using System.IO;

    // extracts all file extensions from a specified directory
    // and spits them out in the console

    var path = Directory.GetCurrentDirectory();
    var root_path = new DirectoryInfo(path);

    // this fetches all file info, extracts the extension, 
    // filters the unique ones and sorts them, before outputting it
    // alternatively, you may use 'SearchOption.AllDirectories' for recursive search
    var extensions = root_path.GetFiles("*.*", SearchOption.TopDirectoryOnly)
        .Select(f => f.Extension)
        .Distinct()
        .OrderBy(f => f)
        .ToList();
   
    Console.WriteLine(string.Join(Environment.NewLine, extensions));

/*
	# sample output
	$ scriptcs foo.csx

	.csx
	.DS_Store
	.txt
*/