diff --git a/src/Commands/.editorconfig b/src/Commands/.editorconfig
new file mode 100755
index 0000000..a343628
--- /dev/null
+++ b/src/Commands/.editorconfig
@@ -0,0 +1,3 @@
+[*.{cs,vb}]
+dotnet_diagnostic.CA1822.severity = none
+dotnet_diagnostic.IDE0060.severity = none
diff --git a/src/Commands/Library/ArrangeCommand.cs b/src/Commands/Library/ArrangeCommand.cs
new file mode 100755
index 0000000..0566c70
--- /dev/null
+++ b/src/Commands/Library/ArrangeCommand.cs
@@ -0,0 +1,98 @@
+using ConsoleAppFramework;
+
+namespace MediaOrganizer.Commands.Library;
+
+[RegisterCommands("library")]
+internal class ArrangeCommand
+{
+	/// <summary>
+	///	Arranges files next to mapFile into targetDirectory.
+	/// </summary>
+	/// <param name="mapFile">A file with "="-separated identifiers.</param>
+	/// <param name="targetDirectory">Target directory to store value-part of mapFile in.</param>
+	[Command("arrange")]
+	public async Task<int> Execute(
+		ConsoleAppContext context,
+		string mapFile,
+		string targetDirectory,
+		CancellationToken cancellationToken = default)
+	{
+		if (new FileInfo(mapFile) is not
+			{
+				Exists: true
+			} mapFileInfo)
+		{
+			throw new ArgumentException($"Map File {mapFile} not found", nameof(mapFile));
+		}
+
+		DirectoryInfo targetDirectoryInfo = new(targetDirectory);
+		targetDirectoryInfo.Create();
+
+		bool error = false;
+		using var reader = mapFileInfo.OpenText();
+		while (await reader.ReadLineAsync(cancellationToken) is { } line)
+		{
+			if (line.AsMemory().Trim() is not
+				{
+					IsEmpty: false
+				} lineMemory)
+			{
+				continue;
+			}
+
+			var sep = lineMemory.Span.LastIndexOf('=');
+			if (lineMemory[(sep + 1)..].Trim() is not
+				{
+					IsEmpty: false
+				} targetMemory)
+			{
+				continue;
+			}
+
+			var sourcePrefix = lineMemory[..sep].Trim().ToString();
+			var targetFile = targetMemory.ToString();
+			var targetFileBaseName = Path.Join(targetDirectoryInfo.FullName, targetFile);
+			var targetFileDirectory = Path.GetDirectoryName(targetFileBaseName);
+			try
+			{
+				Directory.CreateDirectory(targetFileDirectory!);
+			}
+			catch (Exception e)
+			{
+				error = true;
+				ConsoleApp.LogError($"Create target directory for {sourcePrefix} in {targetFileDirectory}: {e.Message}");
+				continue;
+			}
+
+			try
+			{
+				foreach (var file in Directory.EnumerateFiles(mapFileInfo.DirectoryName!, $"{sourcePrefix}*"))
+				{
+					var relative = Path.GetRelativePath(mapFileInfo.DirectoryName!, file);
+					var extension = relative[sourcePrefix.Length..];
+					var target = targetFileBaseName + extension;
+
+					try
+					{
+						if (!File.Exists(target))
+						{
+							File.Copy(file, target);
+						}
+					}
+					catch (Exception e)
+					{
+						error = true;
+						ConsoleApp.LogError($"Copy file {relative} to {target}: {e.Message}");
+					}
+				}
+			}
+			catch (Exception e)
+			{
+				error = true;
+				ConsoleApp.LogError($"Listing directory {mapFileInfo.DirectoryName}: {e.Message}");
+			}
+		}
+
+		return error ? 1 : 0;
+	}
+}
diff --git a/src/Commands/Prepare/ArchiveCommand.cs b/src/Commands/Prepare/ArchiveCommand.cs
new file mode 100755
index 0000000..d838691
--- /dev/null
+++ b/src/Commands/Prepare/ArchiveCommand.cs
@@ -0,0 +1,119 @@
+using ConsoleAppFramework;
+
+using Microsoft.Extensions.Logging;
+
+namespace MediaOrganizer.Commands.Prepare;
+
+[RegisterCommands("prepare")]
+internal class ArchiveCommand
+{
+	/// <summary>
+	/// Create a map file from a youtube-dl archive file.
+	/// </summary>
+	/// <param name="mapFile"></param>
+	/// <param name="archiveFile"></param>
+	/// <param name="episode"></param>
+	/// <param name="episodeNameFormat"></param>
+	[Command("archive")]
+	public async Task Execute(
+		ConsoleAppContext context,
+		string mapFile,
+		string archiveFile,
+		int episode = 1,
+		string episodeNameFormat = "S01E{Episode:00}",
+		CancellationToken cancellationToken = default)
+	{
+		if (new FileInfo(archiveFile) is not
+			{
+				Exists: true
+			} archiveFileInfo)
+		{
+			throw new ArgumentException($"Archive file {archiveFile} has to exist", nameof(archiveFile));
+		}
+
+		FileInfo mapFileInfo = new(mapFile);
+		LogValuesFormat format = new(episodeNameFormat);
+		HashSet<string> skip = [];
+		using var mapStream = mapFileInfo.Open(FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
+		if (mapStream.Length > 0)
+		{
+			using StreamReader reader = new(mapStream, leaveOpen: true);
+			while (await reader.ReadLineAsync(cancellationToken) is { } line)
+			{
+				if (line.AsMemory().Trim() is not
+					{
+						IsEmpty: false
+					} memory)
+				{
+					continue;
+				}
+
+				int sep = memory.Span.LastIndexOf('=');
+				if (sep == -1)
+				{
+					continue;
+				}
+
+				var key = memory[..sep];
+				var path = key.Span.LastIndexOfAny([Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar]);
+				if (path != -1)
+				{
+					key = key[(path + 1)..];
+				}
+
+				skip.Add(key.Trim().ToString());
+			}
+		}
+
+		var relativePath = Path.GetRelativePath(
+			mapFileInfo.DirectoryName!,
+			archiveFileInfo.DirectoryName!);
+		if (relativePath is ".")
+		{
+			relativePath = string.Empty;
+		}
+
+		if (format.ValueNames.Count > 1)
+		{
+			throw new ArgumentException("Episode format has too many unique format values.", nameof(episodeNameFormat));
+		}
+
+		var formatArgs = new object[format.ValueNames.Count];
+		EpisodeFormat? episodeFormat = null;
+		for (int i = 0; i < format.ValueNames.Count; i++)
+		{
+			string formatKey;
+			formatArgs[i] = (formatKey = format.ValueNames[i]) switch
+			{
+				"Episode" => episodeFormat = new()
+				{
+					Episode = episode
+				},
+				_ => throw new ArgumentException($"Format value {formatKey} unrecognized.", nameof(episodeNameFormat)),
+			};
+		}
+
+		using StreamWriter mapWriter = new(mapStream, leaveOpen: true);
+		using var archiveReader = archiveFileInfo.OpenText();
+		while (await archiveReader.ReadLineAsync(cancellationToken) is { } line)
+		{
+			if (ID_MATCHER.Match(line) is not { Success: true } match)
+			{
+				continue;
+			}
+
+			var id = match.Groups["id"].Value;
+			if (skip.Contains(id))
+			{
+				continue;
+			}
+
+			var written = string.Format(null, format.Format, formatArgs);
+			mapWriter.WriteLine($"{Path.Join(relativePath, id)}={written}");
+			if (episodeFormat is not null)
+			{
+				episodeFormat.Episode++;
+			}
+		}
+	}
+}
diff --git a/src/Commands/Prepare/EpisodeFormat.cs b/src/Commands/Prepare/EpisodeFormat.cs
new file mode 100644
index 0000000..e5d7975
--- /dev/null
+++ b/src/Commands/Prepare/EpisodeFormat.cs
@@ -0,0 +1,20 @@
+namespace MediaOrganizer.Commands.Prepare;
+
+internal sealed record class EpisodeFormat : ISpanFormattable, IUtf8SpanFormattable
+{
+	private int _episode;
+
+	public ref int Episode => ref _episode;
+
+	public string ToString(string? format, IFormatProvider? formatProvider) => _episode.ToString(formatProvider);
+
+	public bool TryFormat(Span<byte> utf8Destination, out int bytesWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
+	{
+		return _episode.TryFormat(utf8Destination, out bytesWritten, format, provider);
+	}
+
+	public bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider? provider)
+	{
+		return _episode.TryFormat(destination, out charsWritten, format, provider);
+	}
+}
diff --git a/src/Commands/Prepare/MapCommand.cs b/src/Commands/Prepare/MapCommand.cs
new file mode 100755
index 0000000..8be8b3d
--- /dev/null
+++ b/src/Commands/Prepare/MapCommand.cs
@@ -0,0 +1,113 @@
+using ConsoleAppFramework;
+
+using Microsoft.Extensions.FileSystemGlobbing;
+using Microsoft.Extensions.FileSystemGlobbing.Abstractions;
+using Microsoft.Extensions.Logging;
+
+namespace MediaOrganizer.Commands.Prepare;
+
+[RegisterCommands("prepare")]
+internal class MapCommand
+{
+	/// <summary>
+	/// Creates a mapFile, and applies a format onto all files.
+	/// </summary>
+	/// <param name="mapFile">Path to map file.</param>
+	/// <param name="include">Include pattern to include relative to mapFile directory.</param>
+	/// <param name="episode">Episode number to start with for new entries in mapFile.</param>
+	/// <param name="episodeNameFormat">Format to store mapping in mapFile. Possible options:
+	/// - Episode: integer
+	/// </param>
+	[Command("map")]
+	public async Task Execute(
+		ConsoleAppContext context,
+		string mapFile,
+		string[] include,
+		int episode = 1,
+		string episodeNameFormat = "S01E{Episode:00}",
+		CancellationToken cancellationToken = default)
+	{
+		FileInfo mapFileInfo = new(mapFile);
+		Matcher matcher = new(StringComparison.OrdinalIgnoreCase);
+		matcher.AddIncludePatterns(include);
+		LogValuesFormat format = new(episodeNameFormat);
+		SortedSet<string> episodes = new(StringComparer.OrdinalIgnoreCase);
+		foreach (var item in matcher.Execute(new DirectoryInfoWrapper(mapFileInfo.Directory!)).Files)
+		{
+			var nameWithoutExtension = StripExtension(item.Path);
+			if (!episodes.AnyStartsWith(nameWithoutExtension, StringComparison.OrdinalIgnoreCase))
+			{
+				episodes.RemovePrefix(nameWithoutExtension, StringComparison.OrdinalIgnoreCase);
+				episodes.Add(nameWithoutExtension.ToString());
+			}
+		}
+
+		using var mapStream = mapFileInfo.Open(FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
+		if (mapStream.Length > 0)
+		{
+			using StreamReader reader = new(mapStream, leaveOpen: true);
+			while (await reader.ReadLineAsync(cancellationToken) is { } line)
+			{
+				if (line.AsMemory().Trim() is not
+					{
+						IsEmpty: false
+					} memory)
+				{
+					continue;
+				}
+
+				var sep = memory.Span.LastIndexOf('=');
+				if (sep == -1)
+				{
+					continue;
+				}
+
+				episodes.Remove(memory[..sep].Trim().NormalizePath());
+			}
+		}
+
+		if (format.ValueNames.Count > 1)
+		{
+			throw new ArgumentException("Episode format has too many unique format values.", nameof(episodeNameFormat));
+		}
+
+		var formatArgs = new object[format.ValueNames.Count];
+		EpisodeFormat? episodeFormat = null;
+		for (int i = 0; i < format.ValueNames.Count; i++)
+		{
+			string formatKey;
+			formatArgs[i] = (formatKey = format.ValueNames[i]) switch
+			{
+				"Episode" => episodeFormat = new()
+				{
+					Episode = episode
+				},
+				_ => throw new ArgumentException($"Format value {formatKey} unrecognized.", nameof(episodeNameFormat)),
+			};
+		}
+
+		object[] formatList = [format];
+		using StreamWriter mapWriter = new(mapStream, leaveOpen: true);
+		foreach (var item in episodes)
+		{
+			var written = string.Format(null, format.Format, formatArgs);
+			mapWriter.WriteLine($"{item}={written}");
+			if (episodeFormat is not null)
+			{
+				episodeFormat.Episode++;
+			}
+		}
+	}
+
+	static ReadOnlySpan<char> StripExtension(in ReadOnlySpan<char> path)
+	{
+		var fileName = Path.GetFileName(path);
+		int i;
+		if ((i = fileName.LastIndexOf('.')) == -1)
+		{
+			return path;
+		}
+
+		return path[..^(fileName.Length - i)];
+	}
+}
diff --git a/src/Microsoft/Extensions/Logging/LogValuesFormat.cs b/src/Microsoft/Extensions/Logging/LogValuesFormat.cs
new file mode 100644
index 0000000..80ea436
--- /dev/null
+++ b/src/Microsoft/Extensions/Logging/LogValuesFormat.cs
@@ -0,0 +1,22 @@
+using System.Runtime.CompilerServices;
+using System.Text;
+
+namespace Microsoft.Extensions.Logging;
+
+public readonly struct LogValuesFormat(string format)
+{
+	private readonly LogValuesFormatter _instance = Create(format);
+
+	public CompositeFormat Format => GetFormat(_instance);
+
+	public List<string> ValueNames => GetValueNames(_instance);
+
+	[UnsafeAccessor(UnsafeAccessorKind.Constructor)]
+	private static extern LogValuesFormatter Create(string format);
+
+	[UnsafeAccessor(UnsafeAccessorKind.Field, Name = nameof(LogValuesFormatter._format))]
+	private static extern ref CompositeFormat GetFormat(LogValuesFormatter instance);
+
+	[UnsafeAccessor(UnsafeAccessorKind.Field, Name = nameof(LogValuesFormatter._valueNames))]
+	private static extern ref List<string> GetValueNames(LogValuesFormatter instance);
+}
diff --git a/src/Program.cs b/src/Program.cs
index c93d2ea..ec885ca 100755
--- a/src/Program.cs
+++ b/src/Program.cs
@@ -90,4 +90,13 @@ ConsoleApp.Create().Run(args);
 
 internal static partial class Program
 {
+	public static Regex FILEID_MATCHER => field ??= FileIdMatcherRegex();
+
+	public static Regex ID_MATCHER => field ??= IdMatcherRegex();
+
+	[GeneratedRegex(@"\[(?<id>[^\[]+)\](?=\..+$)")]
+	private static partial Regex FileIdMatcherRegex();
+
+	[GeneratedRegex("^(?<parser>.+?) (?<id>.+?)$")]
+	private static partial Regex IdMatcherRegex();
 }
diff --git a/src/System/Collections/Generic/PathExtensions.cs b/src/System/Collections/Generic/PathExtensions.cs
new file mode 100644
index 0000000..9da4d81
--- /dev/null
+++ b/src/System/Collections/Generic/PathExtensions.cs
@@ -0,0 +1,46 @@
+namespace System.Collections.Generic;
+
+public static class PathExtensions
+{
+	public static bool AnyStartsWith(this SortedSet<string> files, ReadOnlySpan<char> prefix, StringComparison comparison)
+	{
+		using var enumerator = files.GetEnumerator();
+		return AnyStartsWith(enumerator, prefix, comparison);
+	}
+
+	public static int RemovePrefix(this SortedSet<string> files, ReadOnlySpan<char> prefix, StringComparison comparison)
+	{
+		List<string> matches = [];
+		foreach (var file in files)
+		{
+			if (file.StartsWith(prefix, comparison))
+			{
+				matches.Add(file);
+			}
+		}
+
+		int actuallyRemoved = 0;
+		for (int i = matches.Count - 1; i >= 0; i--)
+		{
+			if (files.Remove(matches[i]))
+			{
+				actuallyRemoved++;
+			}
+		}
+
+		return actuallyRemoved;
+	}
+
+	private static bool AnyStartsWith<T>(in T files, ReadOnlySpan<char> prefix, StringComparison comparison) where T : IEnumerator<string>
+	{
+		while (files.MoveNext())
+		{
+			if (files.Current.StartsWith(prefix, comparison))
+			{
+				return true;
+			}
+		}
+
+		return false;
+	}
+}
diff --git a/src/System/IO/StringExtensions.cs b/src/System/IO/StringExtensions.cs
new file mode 100644
index 0000000..fbe5db3
--- /dev/null
+++ b/src/System/IO/StringExtensions.cs
@@ -0,0 +1,21 @@
+namespace System.IO;
+
+public static partial class StringExtensions
+{
+	public static string NormalizePath(in this ReadOnlyMemory<char> path)
+	{
+		return string.Create(path.Length, path, (c, path) =>
+		{
+			var writer = c.GetEnumerator();
+			foreach (ref readonly var s in path.Span)
+			{
+				writer.MoveNext();
+				ref var t = ref writer.Current;
+				if ((t = s) == Path.DirectorySeparatorChar)
+				{
+					t = Path.AltDirectorySeparatorChar;
+				}
+			}
+		});
+	}
+}
diff --git a/src/media-organizer.csproj b/src/media-organizer.csproj
index 3e8214b..5555ba7 100755
--- a/src/media-organizer.csproj
+++ b/src/media-organizer.csproj
@@ -19,8 +19,13 @@
     <TrimMode>partial</TrimMode>
   </PropertyGroup>
   
+  <PropertyGroup>
+    <PublicizerRuntimeStrategies>Unsafe</PublicizerRuntimeStrategies>
+  </PropertyGroup>
+  
   <ItemGroup>
     <EmbeddedResource Include="Properties\appsettings.json" />
+    <Publicize Include="Microsoft.Extensions.Logging.Abstractions" />
   </ItemGroup>
 
   <ItemGroup>
@@ -28,6 +33,10 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="Krafs.Publicizer" Version="2.3.0">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
     <PackageReference Include="Microsoft.Extensions.Configuration" Version="9.0.10" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="9.0.10" />
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="9.0.10" />