diff --git a/main.go b/main.go
index 4f1b94f..487c512 100644
--- a/main.go
+++ b/main.go
@@ -12,11 +12,13 @@ import (
 type Command struct {
 	Name        string
 	Description string
-	Action      func([]string) (string, error)
+	Action      CommandAction
 	Arguments   []string
 	IsVarargs   bool
 }
 
+type CommandAction func([]string, []string) (string, error)
+
 var commands = []Command{
 	{
 		Name:        "install",
@@ -24,38 +26,35 @@ var commands = []Command{
 		Arguments:   []string{"game name", "archive path"},
 		IsVarargs:   true,
 
-		Action: func(arguments []string) (string, error) {
-			var argumentCount = len(arguments)
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
+			var argumentCount = len(providedArguments)
 
-			if argumentCount == 0 {
-				return "", fmt.Errorf("expected game name")
+			if argumentCount < len(requiredArguments) {
+				return "", fmt.Errorf("expected game name folowed by at least one archive path")
 			}
 
-			var archivePaths = arguments[1:]
-			var processed = 0
+			var archivePaths = providedArguments[1:]
 
-			if gameError := WithGame(arguments[0], func(game *Game) error {
+			if gameError := WithGame(providedArguments[0], func(game *Game) error {
 				for i := range archivePaths {
 					var archivePath = archivePaths[i]
 					var extension = filepath.Ext(archivePath)
 
 					if len(extension) == 0 {
-						continue
-					} else {
-						extension = extension[1:]
+						return fmt.Errorf("missing file extension: `%s`", archivePath)
 					}
 
-					var extractor, extractorExists = extractors[extension]
+					var extractor, extractorExists = extractors[extension[1:]]
 
 					if !(extractorExists) {
-						continue
+						return fmt.Errorf("unsupported file format: `%s`", archivePath)
 					}
 
-					if game.InstallMod(extractor, archivePath) != nil {
-						continue
-					}
+					if installError := game.InstallMod(
+						extractor, archivePath); installError != nil {
 
-					processed += 1
+						return installError
+					}
 				}
 
 				return nil
@@ -63,7 +62,7 @@ var commands = []Command{
 				return "", gameError
 			}
 
-			return fmt.Sprint(processed, " of ", len(archivePaths), " installed"), nil
+			return "mods installed", nil
 		},
 	},
 
@@ -73,31 +72,19 @@ var commands = []Command{
 		Arguments:   []string{"game name", "mod name"},
 		IsVarargs:   true,
 
-		Action: func(arguments []string) (string, error) {
-			var argumentCount = len(arguments)
-
-			if argumentCount == 0 {
-				return "", fmt.Errorf("expected game name")
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
+			if len(providedArguments) < len(requiredArguments) {
+				return "", fmt.Errorf("expected %s followed by one or more %ss",
+					requiredArguments[0], requiredArguments[1])
 			}
 
-			var modsToRemove = arguments[1:]
-			var removedMods = []string{}
-
-			if gameError := WithGame(arguments[0], func(game *Game) error {
-				var removed, removeError = game.RemoveMods(modsToRemove)
-
-				if removeError != nil {
-					return removeError
-				}
-
-				removedMods = removed
-
-				return nil
+			if gameError := WithGame(providedArguments[0], func(game *Game) error {
+				return game.RemoveMods(providedArguments[1:])
 			}); gameError != nil {
 				return "", gameError
 			}
 
-			return fmt.Sprint(len(removedMods), " of ", len(removedMods), " removed"), nil
+			return "removed mods", nil
 		},
 	},
 
@@ -107,13 +94,16 @@ var commands = []Command{
 		Arguments:   []string{"game name", "mod name", "new name"},
 		IsVarargs:   false,
 
-		Action: func(arguments []string) (string, error) {
-			if len(arguments) != 3 {
-				return "", fmt.Errorf("expected game name followed by mod name and new name")
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
+			if len(providedArguments) != len(requiredArguments) {
+				return "", fmt.Errorf("expected %s followed by %s and %s",
+					requiredArguments[0], requiredArguments[1], requiredArguments[2])
 			}
 
-			if gameError := WithGame(arguments[0], func(game *Game) error {
-				if removeError := game.RenameMod(arguments[1], arguments[2]); removeError != nil {
+			if gameError := WithGame(providedArguments[0], func(game *Game) error {
+				if removeError := game.RenameMod(providedArguments[1],
+					providedArguments[2]); removeError != nil {
+
 					return removeError
 				}
 
@@ -132,22 +122,23 @@ var commands = []Command{
 		Arguments:   []string{"game name", "format"},
 		IsVarargs:   false,
 
-		Action: func(arguments []string) (string, error) {
-			if len(arguments) != 2 {
-				return "", fmt.Errorf("expected game name followed by format")
+		Action: func(requiredArguments []string, providedArguments []string) (string, error) {
+			if len(providedArguments) != len(requiredArguments) {
+				return "", fmt.Errorf("expected %s followed by %s",
+					requiredArguments[0], requiredArguments[1])
 			}
 
 			var modManifest = ""
 
-			if gameError := WithGame(arguments[0], func(game *Game) error {
-				var format = arguments[1]
+			if gameError := WithGame(providedArguments[0], func(game *Game) error {
+				var format = providedArguments[1]
 				var formatter, formatterExists = formatters[format]
 
 				if !(formatterExists) {
 					return fmt.Errorf("unsupported format: `%s`", format)
 				}
 
-				var formattedManifest, formatError = formatter(game.Mods)
+				var formattedManifest, formatError = formatter(game.ModOrder)
 
 				if formatError != nil {
 					return formatError
@@ -172,9 +163,76 @@ var commands = []Command{
 		Arguments:   []string{"game name"},
 		IsVarargs:   false,
 
-		Action: func(arguments []string) (string, error) {
-			// TODO: Implement.
-			return "", fmt.Errorf("not implemented")
+		Action: func(requiredArguments []string, arguments []string) (string, error) {
+			if len(arguments) != len(requiredArguments) {
+				return "", fmt.Errorf("expected %s", requiredArguments[0])
+			}
+
+			if gameError := WithGame(arguments[0], func(game *Game) error {
+				var deployError = game.Deploy()
+
+				if deployError != nil {
+					return deployError
+				}
+
+				return nil
+			}); gameError != nil {
+				return "", gameError
+			}
+
+			return "deployed", nil
+		},
+	},
+
+	{
+		Name:        "disable",
+		Description: "Disable one or more installed mods",
+		Arguments:   []string{"game name", "mod name"},
+		IsVarargs:   true,
+
+		Action: func(requiredArguments []string, arguments []string) (string, error) {
+			if len(arguments) < len(requiredArguments) {
+				return "", fmt.Errorf("expected %s followed by one or more %ss",
+					requiredArguments[0], requiredArguments[1])
+			}
+
+			if gameError := WithGame(arguments[0], func(game *Game) error {
+				if enableError := game.SwitchMods(false, arguments[1:]); enableError != nil {
+					return enableError
+				}
+
+				return nil
+			}); gameError != nil {
+				return "", gameError
+			}
+
+			return "enabled", nil
+		},
+	},
+
+	{
+		Name:        "enable",
+		Description: "Enable one or more installed mods",
+		Arguments:   []string{"game name", "mod name"},
+		IsVarargs:   true,
+
+		Action: func(requiredArguments []string, arguments []string) (string, error) {
+			if len(arguments) < len(requiredArguments) {
+				return "", fmt.Errorf("expected %s followed by one or more %ss",
+					requiredArguments[0], requiredArguments[1])
+			}
+
+			if gameError := WithGame(arguments[0], func(game *Game) error {
+				if enableError := game.SwitchMods(true, arguments[1:]); enableError != nil {
+					return enableError
+				}
+
+				return nil
+			}); gameError != nil {
+				return "", gameError
+			}
+
+			return "enabled", nil
 		},
 	},
 }
@@ -291,7 +349,7 @@ func main() {
 		var command = commands[i]
 
 		if command.Name == commandName {
-			var response, actionError = command.Action(os.Args[2:])
+			var response, actionError = command.Action(command.Arguments, os.Args[2:])
 
 			if actionError != nil {
 				fmt.Fprintln(os.Stderr, actionError.Error())
diff --git a/manager.go b/manager.go
index c3ad695..85931ac 100644
--- a/manager.go
+++ b/manager.go
@@ -1,8 +1,11 @@
 package main
 
 import (
+	"bufio"
 	"encoding/csv"
 	"fmt"
+	"io"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -12,33 +15,193 @@ type App struct {
 	ConfigDirPath string
 }
 
+func (game *Game) CachePath() (string, error) {
+	var path, pathError = os.UserCacheDir()
+
+	if pathError != nil {
+		return "", pathError
+	}
+
+	path = filepath.Join(path, "modman", game.ID)
+
+	if mkdirError := os.MkdirAll(path, 0755); mkdirError != nil {
+		return "", mkdirError
+	}
+
+	return path, nil
+}
+
+func (game *Game) Clean() error {
+	var cachePath, cachePathError = game.CachePath()
+
+	if cachePathError != nil {
+		return cachePathError
+	}
+
+	var deployedListPath = filepath.Join(cachePath, "backup", "deployed.txt")
+
+	if backupFile, openError := os.Open(deployedListPath); !(os.IsNotExist(openError)) {
+		defer backupFile.Close()
+
+		var scanner = bufio.NewScanner(backupFile)
+
+		for scanner.Scan() {
+			var
+		}
+	}
+
+	return nil
+}
+
+func (game *Game) ConfigPath() (string, error) {
+	var path, pathError = os.UserConfigDir()
+
+	if pathError != nil {
+		return "", pathError
+	}
+
+	path = filepath.Join(path, "modman", game.ID)
+
+	if mkdirError := os.MkdirAll(path, 0755); mkdirError != nil {
+		return "", mkdirError
+	}
+
+	return path, nil
+}
+
+func (game *Game) Deploy() error {
+	var cachePath, cachePathError = game.CachePath()
+
+	if cachePathError != nil {
+		return cachePathError
+	}
+
+	var configPath, configPathError = game.ConfigPath()
+
+	if configPathError != nil {
+		return configPathError
+	}
+
+	var backupPath = filepath.Join(cachePath, "backup")
+	var deployedListPath = filepath.Join(backupPath, "deployed.txt")
+
+	if backupFile, openError := os.Open(deployedListPath); !(os.IsNotExist(openError)) {
+		defer backupFile.Close()
+
+		var scanner = bufio.NewScanner(backupFile)
+
+		for scanner.Scan() {
+			var
+		}
+	}
+
+	var modsPath = filepath.Join(configPath, "mods")
+
+	for i := range game.ModOrder {
+		var mod = game.ModOrder[i]
+
+		if mod.IsEnabled {
+			var modPath = filepath.Join(modsPath, mod.Name)
+
+			if walkError := filepath.WalkDir(modPath, func(
+				path string, dirEntry fs.DirEntry, dirError error) error {
+
+				if dirError != nil {
+					return dirError
+				}
+
+				var fileMode = dirEntry.Type()
+
+				if !(fileMode.IsDir()) {
+					var localPath, relativeError = filepath.Rel(modPath, path)
+
+					if relativeError != nil {
+						return relativeError
+					}
+
+					var linkPath = filepath.Join(game.Path, localPath)
+
+					if pathError := os.MkdirAll(filepath.Dir(linkPath),
+						fileMode.Perm()); pathError != nil {
+
+						return pathError
+					}
+
+					if _, statError := os.Stat(linkPath); !(os.IsNotExist(statError)) {
+						var sourceFile, sourceOpenError = os.Open(linkPath)
+
+						if sourceOpenError != nil {
+							return sourceOpenError
+						}
+
+						defer sourceFile.Close()
+
+						var targetFile, targetOpenError = os.Create(backupPath)
+
+						if targetOpenError != nil {
+							return targetOpenError
+						}
+
+						defer targetFile.Close()
+
+						var _, copyError = io.Copy(targetFile, sourceFile)
+
+						if copyError != nil {
+							return copyError
+						}
+					}
+
+					if linkError := os.Link(path, linkPath); linkError != nil {
+						return linkError
+					}
+				}
+
+				return nil
+			}); walkError != nil {
+				return walkError
+			}
+		}
+	}
+
+	return nil
+}
+
 type Extractor func(string, string) error
 
 type Game struct {
 	ID         string
-	Mods       map[string]Mod
+	ModOrder   []Mod
+	ModNames   map[string]int
+	Path       string
 	HasUpdated bool
 }
 
 func (game *Game) InstallMod(extractor Extractor, archivePath string) error {
-	var gamePath, pathError = game.Path()
+	var baseName = filepath.Base(archivePath)
+	var modName = strings.TrimSuffix(baseName, filepath.Ext(baseName))
+
+	if _, exists := game.ModNames[modName]; exists {
+		return fmt.Errorf("mod with name already exists: `%s`", modName)
+	}
+
+	var configPath, pathError = game.ConfigPath()
 
 	if pathError != nil {
 		return pathError
 	}
 
-	var baseName = filepath.Base(archivePath)
-	var modName = strings.TrimSuffix(baseName, filepath.Ext(baseName))
-
 	if extractError := extractor(archivePath, filepath.Join(
-		gamePath, "mods", modName)); extractError != nil {
+		configPath, "mods", modName)); extractError != nil {
 
 		return extractError
 	}
 
-	game.Mods[modName] = Mod{
+	game.ModNames[modName] = len(game.ModOrder)
+
+	game.ModOrder = append(game.ModOrder, Mod{
 		IsEnabled: false,
-	}
+		Name:      modName,
+	})
 
 	game.HasUpdated = true
 
@@ -47,6 +210,30 @@ func (game *Game) InstallMod(extractor Extractor, archivePath string) error {
 
 type Mod struct {
 	IsEnabled bool
+	Name      string
+	Source    string
+}
+
+func (game *Game) SwitchMods(isEnabled bool, names []string) error {
+	if len(names) != 0 {
+		for i := range names {
+			var name = names[i]
+			var index, exists = game.ModNames[name]
+
+			if !(exists) {
+				return fmt.Errorf("mod does not exist: `%s`", name)
+			}
+
+			var mod = game.ModOrder[index]
+
+			mod.IsEnabled = isEnabled
+			game.ModOrder[index] = mod
+		}
+
+		game.HasUpdated = true
+	}
+
+	return nil
 }
 
 func WithGame(gameName string, action func(*Game) error) error {
@@ -58,17 +245,19 @@ func WithGame(gameName string, action func(*Game) error) error {
 		if gameName == supportedGame {
 			var game = Game{
 				ID:         supportedGame,
-				Mods:       make(map[string]Mod),
+				ModOrder:   make([]Mod, 0, 512),
+				ModNames:   make(map[string]int),
 				HasUpdated: false,
+				Path:       "/home/kayomn/.steam/steam/steamapps/common/Fallout 4/Data",
 			}
 
-			var gamePath, pathError = game.Path()
+			var configPath, pathError = game.ConfigPath()
 
 			if pathError != nil {
 				return pathError
 			}
 
-			var manifestPath = filepath.Join(gamePath, "mods.csv")
+			var manifestPath = filepath.Join(configPath, "mods.csv")
 
 			// Load manifest from disk.
 			{
@@ -92,9 +281,13 @@ func WithGame(gameName string, action func(*Game) error) error {
 						var status = recordValues[0]
 						var name = recordValues[1]
 
-						game.Mods[name] = Mod{
+						game.ModNames[name] = len(game.ModOrder)
+
+						game.ModOrder = append(game.ModOrder, Mod{
 							IsEnabled: status == "*",
-						}
+							Name:      name,
+							Source:    "",
+						})
 
 						recordValues, recordError = manifestReader.Read()
 					}
@@ -107,8 +300,7 @@ func WithGame(gameName string, action func(*Game) error) error {
 
 			// Save manifest back to disk.
 			if game.HasUpdated {
-				var manifestFile, openError = os.OpenFile(manifestPath,
-					os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+				var manifestFile, openError = os.Create(manifestPath)
 
 				if openError != nil {
 					return openError
@@ -118,14 +310,15 @@ func WithGame(gameName string, action func(*Game) error) error {
 
 				var manifestWriter = csv.NewWriter(manifestFile)
 
-				for name, mod := range game.Mods {
+				for i := range game.ModOrder {
+					var mod = game.ModOrder[i]
 					var status = ""
 
 					if mod.IsEnabled {
 						status = "*"
 					}
 
-					manifestWriter.Write([]string{status, name})
+					manifestWriter.Write([]string{status, mod.Name, mod.Source})
 				}
 
 				manifestWriter.Flush()
@@ -138,65 +331,63 @@ func WithGame(gameName string, action func(*Game) error) error {
 	return fmt.Errorf("%s: game not supported", gameName)
 }
 
-func (game Game) Path() (string, error) {
-	var configDirPath, configError = os.UserConfigDir()
-
-	if configError != nil {
-		return "", configError
-	}
-
-	return filepath.Join(configDirPath, "modman", game.ID), nil
-}
-
-func (game *Game) RemoveMods(modNames []string) ([]string, error) {
-	var gamePath, pathError = game.Path()
-
-	if pathError != nil {
-		return nil, pathError
-	}
-
-	var processed = 0
-
-	for i := range modNames {
-		var modName = modNames[i]
-
-		if removeError := os.RemoveAll(filepath.Join(gamePath, modName)); removeError != nil {
-			return nil, removeError
-		}
-
-		delete(game.Mods, modName)
-
-		game.HasUpdated = true
-		processed += 1
-	}
-
-	return modNames[0:processed], nil
-}
-
-func (game *Game) RenameMod(modName string, newName string) error {
-	var gamePath, pathError = game.Path()
+func (game *Game) RemoveMods(names []string) error {
+	var configPath, pathError = game.ConfigPath()
 
 	if pathError != nil {
 		return pathError
 	}
 
-	if _, exists := game.Mods[modName]; !(exists) {
+	if len(names) != 0 {
+		game.HasUpdated = true
+
+		for i := range names {
+			var name = names[i]
+			var index, exists = game.ModNames[name]
+
+			if !(exists) {
+				return fmt.Errorf("unknown mod: `%s`", name)
+			}
+
+			if removeError := os.RemoveAll(filepath.Join(configPath, name)); removeError != nil {
+				return removeError
+			}
+
+			game.ModOrder = append(game.ModOrder[:index], game.ModOrder[index+1:]...)
+
+			delete(game.ModNames, name)
+		}
+	}
+
+	return nil
+}
+
+func (game *Game) RenameMod(modName string, newName string) error {
+	var configPath, pathError = game.ConfigPath()
+
+	if pathError != nil {
+		return pathError
+	}
+
+	if _, exists := game.ModNames[modName]; !(exists) {
 		return fmt.Errorf("no mod with that name exists")
 	}
 
-	if _, exists := game.Mods[newName]; exists {
+	if _, nameTaken := game.ModNames[newName]; nameTaken {
 		return fmt.Errorf("a mod with the new name already exists")
 	}
 
-	if renameError := os.Rename(filepath.Join(gamePath, modName),
-		filepath.Join(gamePath, newName)); renameError != nil {
+	var modsPath = filepath.Join(configPath, "mods")
+
+	if renameError := os.Rename(filepath.Join(modsPath, modName),
+		filepath.Join(modsPath, newName)); renameError != nil {
 
 		return renameError
 	}
 
-	game.Mods[newName] = game.Mods[modName]
+	game.ModNames[newName] = game.ModNames[modName]
 
-	delete(game.Mods, modName)
+	delete(game.ModNames, modName)
 
 	game.HasUpdated = true