diff --git a/game.gd b/game.gd
index d4e8eeb..27f6c91 100644
--- a/game.gd
+++ b/game.gd
@@ -1,31 +1,11 @@
 extends Node
 
 var tmp_prefix = "/tmp/"
-var cwd
 var global_shell
 
 func _ready():
 	global_shell = Shell.new()
 	global_shell.cd(tmp_prefix)
-	
-	cwd = global_shell.run("pwd")
-	# Remove trailing newline.
-	cwd = cwd.substr(0,len(cwd)-1)
-
-# Run a simple command with arguments, blocking, using OS.execute.
-func exec(command, args=[]):
-	var debug = true
-	if debug:
-		print("game.exec: %s [%s]" % [command, PoolStringArray(args).join(", ")])
-		
-	var output = []
-	OS.execute(command, args, true, output, true)
-	output = output[0]
-	
-	if debug:
-		print(output)
-
-	return output
 
 func read_file(path):
 	print ("reading " + path)
diff --git a/main.gd b/main.gd
index 65466ef..2e05ca1 100644
--- a/main.gd
+++ b/main.gd
@@ -67,8 +67,8 @@ func load_level(id):
 		get_tree().quit()
 	
 	# Danger zone!
-	game.exec("rm", ["-rf", active_repository_path])
-	game.exec("rm", ["-rf", goal_repository_path])
+	game.global_shell.run("rm -rf '%s'" % active_repository_path)
+	game.global_shell.run("rm -rf '%s'" % goal_repository_path)
 	
 	construct_repo(goal_script, goal_repository_path)
 	construct_repo(active_script, active_repository_path)
diff --git a/shell.gd b/shell.gd
index 701f16e..7514748 100644
--- a/shell.gd
+++ b/shell.gd
@@ -9,7 +9,7 @@ func _init():
 	_fake_editor = game.tmp_prefix + "fake-editor"
 	var content = game.read_file("res://scripts/fake-editor")
 	game.write_file(_fake_editor, content)
-	run("chmod u+x " + _fake_editor)
+	_exec("chmod", ["u+x", _fake_editor])
 	
 func cd(dir):
 	_cwd = dir
@@ -17,7 +17,7 @@ func cd(dir):
 # Run a shell command given as a string. Run this if you're interested in the
 # output of the command.
 func run(command):
-	var debug = false
+	var debug = true
 	
 	if debug:
 		print("$ %s" % command)
@@ -31,9 +31,25 @@ func run(command):
 	hacky_command += "cd '%s';" % _cwd
 	hacky_command += command
 	
-	var output = game.exec("/bin/sh", ["-c",  hacky_command])
+	var output = _exec("/bin/sh", ["-c",  hacky_command])
 	
 	if debug:
 		print(output)
 	
 	return output
+
+# Run a simple command with arguments, blocking, using OS.execute.
+func _exec(command, args=[]):
+	var debug = false
+	
+	if debug:
+		print("exec: %s [%s]" % [command, PoolStringArray(args).join(", ")])
+		
+	var output = []
+	OS.execute(command, args, true, output, true)
+	output = output[0]
+	
+	if debug:
+		print(output)
+
+	return output