diff --git a/src/bin/Disk.hx b/src/bin/Disk.hx
index 6118de6..8e6cd0d 100644
--- a/src/bin/Disk.hx
+++ b/src/bin/Disk.hx
@@ -1,5 +1,6 @@
 package bin;
 
+import kernel.peripherals.Drive;
 import lib.CLIAppBase;
 import kernel.peripherals.Peripherals.Peripheral;
 
@@ -30,37 +31,17 @@ class Disk extends CLIAppBase {
 		});
 
 		registerSyncSubcommand("play", (args) -> {
-			if (args.length < 1) {
-				handle.writeLine("Missing drive address");
-				return false;
-			}
-
-			return audioDiskPlayPause(args[0], true);
-		}, "<drive>");
+			return audioDiskPlayPause(args.getString("addr"), true);
+		}, [Peripheral("addr", Drive.TYPE_NAME)]);
 
 		registerSyncSubcommand("stop", (args) -> {
-			if (args.length < 1) {
-				handle.writeLine("Missing drive address");
-				return false;
-			}
-
-			return audioDiskPlayPause(args[0], false);
-		}, "<drive>");
+			return audioDiskPlayPause(args.getString("addr"), false);
+		}, [Peripheral("addr", Drive.TYPE_NAME)]);
 
 		registerSyncSubcommand("eject", (args) -> {
-			if (args.length < 1) {
-				handle.writeLine("Missing drive address");
-				return false;
-			}
-
-			var driveAddr = args[0];
+			var driveAddr = args.getString("addr");
 			var drive = Peripheral.getDrive(driveAddr);
 
-			if (drive == null) {
-				handle.writeLine("Drive not found: " + driveAddr);
-				return false;
-			}
-
 			if (!drive.isDiskPresent()) {
 				handle.writeLine("No disk in drive: " + driveAddr);
 				return false;
@@ -68,21 +49,12 @@ class Disk extends CLIAppBase {
 
 			drive.ejectDisk();
 			return true;
-		}, "<drive>");
+		}, [Peripheral("addr", Drive.TYPE_NAME)]);
 
-		registerSyncSubcommand("lable", (args) -> {
-			if (args.length < 1) {
-				handle.writeLine("Missing drive address");
-				return false;
-			}
-
-			var driveAddr = args[0];
+		registerSyncSubcommand("label", (args) -> {
+			var driveAddr = args.getString("addr");
 			var drive = Peripheral.getDrive(driveAddr);
-			var label:String = args[1];
-
-			if (drive == null) {
-				handle.writeLine("Drive not found: " + driveAddr);
-			}
+			var label:Null<String> = args.getString("label");
 
 			if (!drive.isDiskPresent()) {
 				handle.writeLine("No disk in drive: " + driveAddr);
@@ -99,7 +71,7 @@ class Disk extends CLIAppBase {
 			}
 
 			return true;
-		}, "<drive> [label]");
+		}, [Peripheral("addr", Drive.TYPE_NAME), Optional(String("label"))]);
 	}
 
 	private function audioDiskPlayPause(driveAddr:String, play:Bool):Bool {
diff --git a/src/bin/GPS.hx b/src/bin/GPS.hx
index 4ca1dde..21a49ca 100644
--- a/src/bin/GPS.hx
+++ b/src/bin/GPS.hx
@@ -11,16 +11,16 @@ using tink.CoreApi;
 class GPS extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("set", (args) -> {
-			var x:Float = Std.parseFloat(args[0]);
-			var y:Float = Std.parseFloat(args[1]);
-			var z:Float = Std.parseFloat(args[2]);
+			var x:Float = args.getFloat("x");
+			var y:Float = args.getFloat("y");
+			var z:Float = args.getFloat("z");
 
 			var pos:Pos3 = new Vec3<Float>(x, y, z);
 
 			kernel.gps.GPS.setManualPosition(pos);
 
 			return true;
-		}, "<x> <y> <z>");
+		}, [Float("x"), Float("y"), Float("z")]);
 
 		registerSyncSubcommand("status", (args) -> {
 			var pos = kernel.gps.GPS.getPosition();
diff --git a/src/bin/KSettings.hx b/src/bin/KSettings.hx
index 423d125..61722d0 100644
--- a/src/bin/KSettings.hx
+++ b/src/bin/KSettings.hx
@@ -7,12 +7,7 @@ import lib.CLIAppBase;
 class KSettings extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("get", (args) -> {
-			var key = args[0];
-
-			if (key == null) {
-				handle.writeLine("Key not specified");
-				return false;
-			}
+			var key = args.getString("key");
 
 			var value = switch (key) {
 				case "hostname":
@@ -30,17 +25,17 @@ class KSettings extends CLIAppBase {
 
 			handle.writeLine(value);
 			return true;
-		}, " <key>");
+		}, [String("key")]);
 
 		registerSyncSubcommand("set", (args) -> {
-			var key = args[0];
+			var key = args.getString("key");
 
 			if (key == null) {
 				handle.writeLine("Key not specified");
 				return false;
 			}
 
-			var value = args[1];
+			var value = args.getString("value");
 
 			if (value == null) {
 				handle.writeLine("Value not specified");
@@ -57,7 +52,7 @@ class KSettings extends CLIAppBase {
 					return false;
 			}
 			return true;
-		}, " <key> <value>");
+		}, [String("key"), String("value")]);
 
 		registerSyncSubcommand("list", (args) -> {
 			handle.writeLine("hostname");
diff --git a/src/bin/Net.hx b/src/bin/Net.hx
index b6a8bec..eaac9b2 100644
--- a/src/bin/Net.hx
+++ b/src/bin/Net.hx
@@ -40,16 +40,7 @@ class Net extends CLIAppBase {
 		});
 
 		registerAsyncSubcommand("ping", (args) -> {
-			if (args.length < 1) {
-				return Future.sync(false);
-			}
-
-			var toID:Null<Int> = Std.parseInt(args[0]);
-
-			if (toID == null) {
-				handle.write("Invalid ID");
-				return Future.sync(false);
-			}
+			var toID:Int = args.getInt("id");
 
 			return kernel.net.Net.ping(toID).map(result -> {
 				switch (result) {
@@ -61,6 +52,6 @@ class Net extends CLIAppBase {
 
 				return true;
 			});
-		}, "<id>");
+		}, [Int("id")]);
 	}
 }
diff --git a/src/bin/Perf.hx b/src/bin/Perf.hx
index e4e4ac0..3083cb9 100644
--- a/src/bin/Perf.hx
+++ b/src/bin/Perf.hx
@@ -7,15 +7,8 @@ import lib.CLIAppBase;
 class Perf extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("inspect", (args) -> {
-			if (args.length < 1)
-				return false;
-
-			var result = Peripheral.inspect(args[0]);
-
-			if (result == null) {
-				handle.writeLine("No peripheral found on side " + args[0]);
-				return true;
-			}
+			var addr = args.getString("addr");
+			var result = Peripheral.inspect(addr);
 
 			handle.writeLine("Types:");
 			for (type in result.types) {
@@ -28,7 +21,7 @@ class Perf extends CLIAppBase {
 			}
 
 			return true;
-		}, "<side>");
+		}, [Addr("addr")]);
 
 		registerSyncSubcommand("list", (args) -> {
 			for (addr in Peripheral.getAllAddresses()) {
diff --git a/src/bin/Redstone.hx b/src/bin/Redstone.hx
index 020fec5..4141c6b 100644
--- a/src/bin/Redstone.hx
+++ b/src/bin/Redstone.hx
@@ -9,19 +9,19 @@ using tink.CoreApi;
 class Redstone extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("on", (args) -> {
-			Peripheral.getRedstone(args[0]).setOutput(true);
+			Peripheral.getRedstone(args.getString("side")).setOutput(true);
 			return true;
-		}, "<side>");
+		}, [Side("side")]);
 
 		registerSyncSubcommand("off", (args) -> {
-			Peripheral.getRedstone(args[0]).setOutput(false);
+			Peripheral.getRedstone(args.getString("side")).setOutput(false);
 			return true;
-		}, "<side>");
+		}, [Side("side")]);
 
 		registerSyncSubcommand("get", (args) -> {
-			var value = Peripheral.getRedstone(args[0]).getAnalogInput();
+			var value = Peripheral.getRedstone(args.getString("side")).getAnalogInput();
 			handle.write("Analog input: " + value);
 			return true;
-		}, "<side>");
+		}, [Side("side")]);
 	}
 }
diff --git a/src/bin/Service.hx b/src/bin/Service.hx
index fd92bfe..45dc4fb 100644
--- a/src/bin/Service.hx
+++ b/src/bin/Service.hx
@@ -9,50 +9,28 @@ using tink.CoreApi;
 class Service extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("start", (args) -> {
-			if (args.length < 1) {
-				return false;
-			}
-
-			var name = args[0];
-
-			var result = ServiceManager.start(name);
+			var result = ServiceManager.start(args.getString("name"));
 			return handleResult(result);
-		}, "<name>");
+		}, [String("name")]);
 
 		registerSyncSubcommand("stop", (args) -> {
-			if (args.length < 1) {
-				return false;
-			}
-
-			var name = args[0];
-
-			var result = ServiceManager.stop(name);
+			var result = ServiceManager.stop(args.getString("name"));
 			return handleResult(result);
-		}, "<name>");
+		}, [String("name")]);
 
 		registerSyncSubcommand("register", (args) -> {
-			if (args.length < 2) {
-				return false;
-			}
-
-			var name = args[0];
-			var binName = args[1];
-			var rest = args.slice(2);
+			var name = args.getString("name");
+			var binName = args.getString("binary");
+			var rest = args.getRest();
 
 			var result = ServiceManager.register(name, binName, rest);
 			return handleResult(result);
-		}, "<name> <binary> [args...]");
+		}, [String("name"), String("binary"), Rest("args")]);
 
 		registerSyncSubcommand("unregister", (args) -> {
-			if (args.length < 2) {
-				return false;
-			}
-
-			var name = args[0];
-
-			var result = ServiceManager.unregister(name);
+			var result = ServiceManager.unregister(args.getString("name"));
 			return handleResult(result);
-		}, "<name>");
+		}, [String("name")]);
 
 		registerSyncSubcommand("list", (args) -> {
 			var list = ServiceManager.listRunning();
@@ -65,13 +43,9 @@ class Service extends CLIAppBase {
 		});
 
 		registerSyncSubcommand("enable", (args) -> {
-			if (args.length < 1) {
-				return false;
-			}
-
-			ServiceManager.enable(args[0]);
+			ServiceManager.enable(args.getString("name"));
 			return true;
-		}, "<name>");
+		}, [String("name")]);
 	}
 
 	private function handleResult(res:Outcome<Noise, String>):Bool {
diff --git a/src/bin/Speaker.hx b/src/bin/Speaker.hx
index d8289be..6228efe 100644
--- a/src/bin/Speaker.hx
+++ b/src/bin/Speaker.hx
@@ -9,33 +9,16 @@ using tink.CoreApi;
 class Speaker extends CLIAppBase {
 	public function new() {
 		registerSyncSubcommand("note", (args) -> {
-			if (args.length < 2) {
-				handle.writeLine("Not enough args");
-				return false;
-			}
+			var sp = Peripheral.getSpeaker(args.getString("addr"));
 
-			var sp = Peripheral.getSpeaker(args[0]);
-
-			var note = args[1];
+			var note = args.getString("note");
 			var r;
 
-			if (args.length > 3) {
-				var volume = Std.parseFloat(args[2]);
-				if (volume == null) {
-					handle.writeLine("Failed to parse volume");
-					return false;
-				}
-
-				if (args.length > 4) {
-					var pitch = Std.parseInt(args[3]);
-					if (pitch == null) {
-						handle.writeLine("Failed to parse pitch");
-						return false;
-					}
-
-					r = sp.playNote(note, volume, pitch);
+			if (args.hasArg("pitch")) {
+				if (args.hasArg("volume")) {
+					r = sp.playNote(note, args.getFloat("volume"), args.getInt("pitch"));
 				} else {
-					r = sp.playNote(note, volume);
+					r = sp.playNote(note, args.getFloat("volume"));
 				}
 			} else {
 				r = sp.playNote(note);
@@ -48,36 +31,24 @@ class Speaker extends CLIAppBase {
 				case Success(_):
 					return true;
 			}
-		}, "<addr> <note> [pitch] [volume]");
+		}, [
+			Peripheral("addr", kernel.peripherals.Speaker.TYPE_NAME),
+			String("note"),
+			Optional(Int("pitch")),
+			Optional(Float("volume"))
+		]);
 
 		registerSyncSubcommand("sound", (args) -> {
-			if (args.length < 2) {
-				handle.writeLine("Not enough args");
-				return false;
-			}
+			var sp = Peripheral.getSpeaker(args.getString("addr"));
 
-			var sp = Peripheral.getSpeaker(args[0]);
-
-			var sound = args[1];
+			var sound = args.getString("sound");
 			var r;
 
-			if (args.length > 3) {
-				var volume = Std.parseFloat(args[2]);
-				if (volume == null) {
-					handle.writeLine("Failed to parse volume");
-					return false;
-				}
-
-				if (args.length > 4) {
-					var pitch = Std.parseFloat(args[3]);
-					if (pitch == null) {
-						handle.writeLine("Failed to parse pitch");
-						return false;
-					}
-
-					r = sp.playSound(sound, volume, pitch);
+			if (args.hasArg("volume")) {
+				if (args.hasArg("pitch")) {
+					r = sp.playSound(sound, args.getFloat("volume"), args.getFloat("pitch"));
 				} else {
-					r = sp.playSound(sound, volume);
+					r = sp.playSound(sound, args.getFloat("volume"));
 				}
 			} else {
 				r = sp.playSound(sound);
@@ -90,6 +61,11 @@ class Speaker extends CLIAppBase {
 				case Success(_):
 					return true;
 			}
-		}, "<addr> <sound> [volume] [pitch]");
+		}, [
+			Peripheral("addr", kernel.peripherals.Speaker.TYPE_NAME),
+			String("sound"),
+			Optional(Float("pitch")),
+			Optional(Float("volume"))
+		]);
 	}
 }
diff --git a/src/bin/TurtleCtl.hx b/src/bin/TurtleCtl.hx
index cf612e9..46b30da 100644
--- a/src/bin/TurtleCtl.hx
+++ b/src/bin/TurtleCtl.hx
@@ -11,28 +11,28 @@ using tink.CoreApi;
 class TurtleCtl extends CLIAppBase {
 	public function new() {
 		registerAsyncSubcommand("f", (args) -> {
-			return asynPerform(Turtle.forward, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.forward, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("b", (args) -> {
-			return asynPerform(Turtle.back, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.back, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("l", (args) -> {
-			return asynPerform(Turtle.turnLeft, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.turnLeft, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("r", (args) -> {
-			return asynPerform(Turtle.turnRight, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.turnRight, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("u", (args) -> {
-			return asynPerform(Turtle.up, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.up, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("d", (args) -> {
-			return asynPerform(Turtle.down, parseTimes(args));
-		}, "<times>");
+			return asynPerform(Turtle.down, args.getInt("times"));
+		}, [Int("times")]);
 
 		registerAsyncSubcommand("defrag", (args) -> {
 			return asynPerform(() -> {
@@ -63,8 +63,9 @@ class TurtleCtl extends CLIAppBase {
 
 		registerAsyncSubcommand("refuel", (args) -> {
 			var refuelTo = Turtle.getFuelLimit();
-			if (args.length > 0) {
-				var split = args[0].split("%");
+			var arg = args.getString("to");
+			if (arg != null) {
+				var split = arg.split("%");
 
 				if (split.length > 1) {
 					// Is percentage
@@ -78,7 +79,7 @@ class TurtleCtl extends CLIAppBase {
 					refuelTo = Math.round(refuelTo * (parsed / 100));
 				} else {
 					// Is absolute
-					var parsed = Std.parseInt(args[0]);
+					var parsed = Std.parseInt(arg);
 
 					if (parsed == null) {
 						handle.writeLine("Failed to parse ammount");
@@ -94,7 +95,7 @@ class TurtleCtl extends CLIAppBase {
 
 				return Success(null);
 			}, 1);
-		}, "<to|to%>");
+		}, [Optional(String("to"))]);
 	}
 
 	private function asynPerform(op:Void->Outcome<Noise, String>, times:Int):Future<Bool> {
diff --git a/src/bin/ns/NameSystemCLI.hx b/src/bin/ns/NameSystemCLI.hx
index 4b2452b..9d620ef 100644
--- a/src/bin/ns/NameSystemCLI.hx
+++ b/src/bin/ns/NameSystemCLI.hx
@@ -8,13 +8,9 @@ using tink.CoreApi;
 class NameSystemCLI extends CLIAppBase {
 	public function new() {
 		registerAsyncSubcommand("get", (args) -> {
-			if (args.length < 1) {
-				return Future.sync(false);
-			}
-
 			var ns = NameSystemRPC.getDefault();
 
-			return ns.getIDRecord(args[0]).map((r) -> {
+			return ns.getIDRecord(args.getString("name")).map((r) -> {
 				switch r {
 					case Success(data):
 						handle.writeLine('Resolved: $data');
@@ -24,23 +20,13 @@ class NameSystemCLI extends CLIAppBase {
 
 				return true;
 			});
-		}, "<name>");
+		}, [String("name")]);
 
 		registerAsyncSubcommand("register", (args) -> {
-			if (args.length < 2) {
-				return Future.sync(false);
-			}
-
-			var id = Std.parseInt(args[1]);
-
-			if (id == null) {
-				handle.writeLine("Not a valid id");
-				return Future.sync(false);
-			}
-
+			var id = args.getInt("id");
 			var ns = NameSystemRPC.getDefault();
 
-			return ns.setIDRecord(args[0], id).map((r) -> {
+			return ns.setIDRecord(args.getString("name"), id).map((r) -> {
 				switch r {
 					case Success(_):
 						handle.writeLine('Set');
@@ -50,7 +36,7 @@ class NameSystemCLI extends CLIAppBase {
 
 				return true;
 			});
-		}, "<name> <id>");
+		}, [String("name"), Int("id")]);
 
 		registerAsyncSubcommand("list", (args) -> {
 			var ns = NameSystemRPC.getDefault();
@@ -68,13 +54,9 @@ class NameSystemCLI extends CLIAppBase {
 		});
 
 		registerAsyncSubcommand("unregister", (args) -> {
-			if (args.length < 1) {
-				return Future.sync(false);
-			}
-
 			var ns = NameSystemRPC.getDefault();
 
-			return ns.removeIDRecord(args[0]).map((r) -> {
+			return ns.removeIDRecord(args.getString("name")).map((r) -> {
 				switch r {
 					case Success(_):
 						handle.writeLine('Unregisterd');
@@ -84,6 +66,6 @@ class NameSystemCLI extends CLIAppBase {
 
 				return true;
 			});
-		}, "<name>");
+		}, [String("name")]);
 	}
 }
diff --git a/src/lib/CLIAppBase.hx b/src/lib/CLIAppBase.hx
index f5afd32..fb34028 100644
--- a/src/lib/CLIAppBase.hx
+++ b/src/lib/CLIAppBase.hx
@@ -1,5 +1,7 @@
 package lib;
 
+import lib.args.CLIArgs;
+import lib.args.ArgType;
 import kernel.ps.IProcess;
 import kernel.ps.ProcessHandle;
 
@@ -8,9 +10,9 @@ using tink.CoreApi;
 abstract class CLIAppBase implements IProcess {
 	private var handle:ProcessHandle;
 
-	private final _subcommandsSync:Map<String, (Array<String>) -> Bool> = [];
-	private final _subcommandsAsync:Map<String, (Array<String>) -> Future<Bool>> = [];
-	private final _subcommandsSynopsis:Array<String> = [];
+	private final _subcommandsSync:Map<String, (CLIArgs) -> Bool> = [];
+	private final _subcommandsAsync:Map<String, (CLIArgs) -> Future<Bool>> = [];
+	private final _subcommandsArgs:Map<String, Array<ArgType>> = [];
 
 	public final function run(handle:ProcessHandle) {
 		this.handle = handle;
@@ -26,10 +28,19 @@ abstract class CLIAppBase implements IProcess {
 		var args = handle.args.slice(1);
 
 		if (_subcommandsSync.exists(subcommand)) {
-			var result = _subcommandsSync[subcommand](args);
-			return handle.close(result);
+			var argParser = new CLIArgs(_subcommandsArgs.get(subcommand));
+			if (!argParser.parse(args)) {
+				handle.writeLine(argParser.getError());
+				return handle.close(false);
+			}
+			return handle.close(_subcommandsSync[subcommand](argParser));
 		} else if (_subcommandsAsync.exists(subcommand)) {
-			_subcommandsAsync[subcommand](args).handle(handle.close);
+			var argParser = new CLIArgs(_subcommandsArgs.get(subcommand));
+			if (!argParser.parse(args)) {
+				handle.writeLine(argParser.getError());
+				return handle.close(false);
+			}
+			_subcommandsAsync[subcommand](argParser).handle(handle.close);
 		} else {
 			handle.writeLine("Unknown subcommand: " + subcommand);
 			printHelp();
@@ -37,21 +48,21 @@ abstract class CLIAppBase implements IProcess {
 		}
 	}
 
-	private function registerSyncSubcommand(command:String, callback:(Array<String>) -> Bool, synopsis:String = null) {
+	private function registerSyncSubcommand(command:String, callback:(CLIArgs) -> Bool, args:Array<ArgType> = null) {
 		_subcommandsSync.set(command, callback);
-		_subcommandsSynopsis.push(command + " " + (synopsis ?? ""));
+		_subcommandsArgs.set(command, args ?? []);
 	}
 
-	private function registerAsyncSubcommand(command:String, callback:(Array<String>) -> Future<Bool>, synopsis:String = null) {
+	private function registerAsyncSubcommand(command:String, callback:(CLIArgs) -> Future<Bool>, args:Array<ArgType> = null) {
 		_subcommandsAsync.set(command, callback);
-		_subcommandsSynopsis.push(command + " " + (synopsis ?? ""));
+		_subcommandsArgs.set(command, args ?? []);
 	}
 
 	private function printHelp() {
 		handle.writeLine("Usage: <subcommand> [args]");
 		handle.writeLine("Subcommands:");
-		for (subcommand in _subcommandsSynopsis) {
-			handle.writeLine("  " + subcommand);
+		for (k => v in this._subcommandsArgs) {
+			handle.writeLine('    $k ${CLIArgs.getSynopsis(v)}');
 		}
 	}
 }