Line Text Comparision Library for TSV files.

Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

public class Program
{
    static void Main(string[] args)
    {
        var lines1 = File.ReadAllLines(args[0]);
        var lines2 = File.ReadAllLines(args[1]);

        var mode = args.Length >= 3 ? args[2] : string.Empty;

        if (!string.IsNullOrEmpty(mode) && mode.StartsWith("--"))
            mode = mode.Substring(2);

        var isReverse = args.Length >= 4 ? (bool.TryParse(args[3], out var _isReverse) ? _isReverse :
            (args[3]?.Equals("--reverse") == true || args[3]?.Equals("-r") == true)) : false;

        if (isReverse)
        {
            var temp = lines2;
            lines2 = lines1;
            lines1 = temp;
        }

        switch (mode)
        {
            case "intersect":
                Dump(lines1.Intersect(lines2));
                break;

            case "except":
                Dump(lines1.Except(lines2));
                break;

            case "exclude":
                {
                    var result = lines1.Concat(lines2)
                        .Distinct();

                    var temp = new List<string>();

                    foreach (var item in lines1)
                    {
                        if (!lines2.Any(x => x.Equals(item, StringComparison.OrdinalIgnoreCase)))
                            temp.Add(item);
                    }

                    foreach (var item in lines2)
                    {
                        if (!lines1.Any(x => x.Equals(item, StringComparison.OrdinalIgnoreCase)))
                            temp.Add(item);
                    }

                    Dump(temp.Distinct());
                }
                break;

            default:
                {
                    var result = new List<string>();

                    foreach (var line1 in lines1)
                    {
                        foreach (var line2 in lines2)
                        {
                            if (!line1.Contains(line2) || !line1.Equals(line2, StringComparison.OrdinalIgnoreCase))
                            {
                                if (!result.Contains(line1))
                                    result.Add(line1);
                            }
                            else if (!line2.Contains(line1) || !line2.Equals(line1, StringComparison.OrdinalIgnoreCase))
                            {
                                if (!result.Contains(line2))
                                    result.Add(line2);
                            }
                        }
                    }

                    Dump(result);
                }
                break;
        }
    }

    static void Dump<T>(IEnumerable<T> collection)
    {
        foreach (var item in collection)
            Console.WriteLine(item);
    }

    static void Dump<T>(List<T> collection)
    {
        foreach (var item in collection)
            Console.WriteLine(item);
    }
}