diff --git a/rwx/os/__init__.py b/rwx/os/__init__.py
new file mode 100644
index 0000000..70ca05c
--- /dev/null
+++ b/rwx/os/__init__.py
@@ -0,0 +1,11 @@
+"""Control Operating Systems."""
+
+from pathlib import Path
+
+
+class OS:
+    """Operating System."""
+
+    def __init__(self, path: str) -> None:
+        """Set root."""
+        self.root = Path(path)