diff --git a/rwx/__main__.py b/rwx/__main__.py
index f6276e4..e19dea1 100755
--- a/rwx/__main__.py
+++ b/rwx/__main__.py
@@ -4,12 +4,12 @@
 
 from pathlib import Path
 
-import fs
+from rwx import fs
 
 if __name__ == "__main__":
-    file_path = Path(__file__).resolve()
-    root_path = file_path.parent
-    directory_path = root_path / "tmp"
+    file_path: Path = Path(__file__).resolve()
+    root_path: Path = file_path.parent
+    directory_path: Path = root_path / "tmp"
     file_path = directory_path / "file"
 
     fs.wipe(directory_path)
diff --git a/rwx/cmd/__init__.py b/rwx/cmd/__init__.py
index e3b75bc..ca4dced 100644
--- a/rwx/cmd/__init__.py
+++ b/rwx/cmd/__init__.py
@@ -6,6 +6,7 @@ packages: list[str] = []
 
 def need(command: str) -> None:
     """Assert package dependency for a command."""
+    package: str | None
     match command:
         case "debootstrap":
             package = "debootstrap"
diff --git a/rwx/cmd/squashfs/__init__.py b/rwx/cmd/squashfs/__init__.py
index 85e20b2..db603da 100644
--- a/rwx/cmd/squashfs/__init__.py
+++ b/rwx/cmd/squashfs/__init__.py
@@ -1,22 +1,18 @@
 """Wrap SquashFS commands."""
 
-import ps
+from rwx import cmd, ps
 
-import rwx.cmd
-
-rwx.cmd.need("mksquashfs")
+cmd.need("mksquashfs")
 
 
 def mksquashfs(input_root: str, output_file: str) -> None:
     """Make a SquashFS bootable image file."""
     ps.run(
-        [
-            "mksquashfs",
-            input_root,
-            output_file,
-            "-comp",
-            "zstd",
-            "-Xcompression-level",
-            str(18),
-        ]
+        "mksquashfs",
+        input_root,
+        output_file,
+        "-comp",
+        "zstd",
+        "-Xcompression-level",
+        str(18),
     )
diff --git a/rwx/deb/__init__.py b/rwx/deb/__init__.py
index f022ca5..fcd4198 100644
--- a/rwx/deb/__init__.py
+++ b/rwx/deb/__init__.py
@@ -1,8 +1,6 @@
 """Wrap Debian commands."""
 
-import cmd
-
-import ps
+from rwx import cmd, ps
 
 cmd.need("debootstrap")
 
@@ -20,4 +18,4 @@ def bootstrap(root_path: str, suite: str, mirror_location: str) -> None:
         (root_path,),
         (mirror_location,),
     ]
-    return ps.run(command)
+    ps.run(*command)
diff --git a/rwx/fs/__init__.py b/rwx/fs/__init__.py
index a8865e7..0685c44 100644
--- a/rwx/fs/__init__.py
+++ b/rwx/fs/__init__.py
@@ -14,11 +14,11 @@ def create_image(file_path: str, size_bytes: int) -> None:
     ps.run(
         ("qemu-img", "create"),
         ("-f", "qcow2"),
-        (file_path, size_bytes),
+        (file_path, str(size_bytes)),
     )
 
 
-def empty_file(path: str) -> None:
+def empty_file(path: Path) -> None:
     """Empty the file at provided path."""
     write(path, "")
 
@@ -36,9 +36,9 @@ def get_mount_uuid(path: str) -> str:
 def get_path_mount(path: str) -> str:
     """Return the mountpoint path of an arbitrary path."""
     return ps.run_line(
-        ("stat",),
+        "stat",
         ("--format", "%m"),
-        (path,),
+        path,
     )
 
 
@@ -47,9 +47,9 @@ def get_path_uuid(path: str) -> str:
     return get_mount_uuid(get_path_mount(path))
 
 
-def make_directory(path: str) -> None:
+def make_directory(path: Path) -> None:
     """Make a directory (and its parents) from a path."""
-    Path(path).mkdir(exist_ok=True, parents=True)
+    path.mkdir(exist_ok=True, parents=True)
 
 
 def read_file_bytes(file_path: str) -> bytes:
@@ -68,17 +68,17 @@ def read_file_text(file_path: str, charset: str = CHARSET) -> str:
     return read_file_bytes(file_path).decode(charset)
 
 
-def wipe(path: str) -> None:
+def wipe(path: Path) -> None:
     """Wipe provided path, whether directory or file."""
     try:
         shutil.rmtree(path)
     except NotADirectoryError:
-        Path(path).unlink(missing_ok=True)
+        path.unlink(missing_ok=True)
     except FileNotFoundError:
         pass
 
 
-def write(file_path: str, text: str, charset: str = CHARSET) -> None:
+def write(file_path: Path, text: str, charset: str = CHARSET) -> None:
     """Write text into a file."""
-    with Path(file_path).open(encoding=charset, mode="w") as file_object:
+    with file_path.open(encoding=charset, mode="w") as file_object:
         file_object.write(text)
diff --git a/rwx/grub/__init__.py b/rwx/grub/__init__.py
index dde847a..accec9f 100644
--- a/rwx/grub/__init__.py
+++ b/rwx/grub/__init__.py
@@ -1,8 +1,6 @@
 """Wrap GRUB commands."""
 
-import cmd
-
-import ps
+from rwx import cmd, ps
 
 cmd.need("grub-mkimage")
 
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)
diff --git a/rwx/prj/__init__.py b/rwx/prj/__init__.py
index 8b70a4a..36dab99 100644
--- a/rwx/prj/__init__.py
+++ b/rwx/prj/__init__.py
@@ -1,6 +1,5 @@
 """Handle projects."""
 
-from os.path import realpath
 from pathlib import Path
 
 
@@ -9,6 +8,6 @@ class Project:
 
     def __init__(self, file_path: str) -> None:
         """Set file, root & name."""
-        self.file: str = realpath(file_path)
-        self.root: str = Path(self.file).parent
+        self.file: Path = Path(file_path).resolve()
+        self.root: Path = self.file.parent
         self.name: str = self.root.name
diff --git a/rwx/prj/sphinx.py b/rwx/prj/sphinx.py
index b85cfa5..be207ef 100644
--- a/rwx/prj/sphinx.py
+++ b/rwx/prj/sphinx.py
@@ -1,5 +1,10 @@
 """Project consisting only of a Sphinx documentation."""
 
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
 from sphinx.cmd.build import build_main
 
 from rwx.fs import wipe
@@ -15,7 +20,7 @@ class SphinxProject(Project):
 
     def build(self) -> None:
         """Build the project."""
-        output_root: str = self.root / "out"
+        output_root: Path = self.root / "out"
         wipe(output_root)
         arguments: list[str] = [
             "-E",
@@ -30,9 +35,9 @@ class SphinxProject(Project):
             "-D",
             "html_theme={}".format("sphinx_rtd_theme"),
             "-c",
-            self.root,
+            str(self.root),
             # "-C",
-            self.root / self.name,
-            output_root / "web",
+            str(self.root / self.name),
+            str(output_root / "web"),
         ]
         build_main(arguments)
diff --git a/rwx/ps/__init__.py b/rwx/ps/__init__.py
index e45672e..e18e250 100644
--- a/rwx/ps/__init__.py
+++ b/rwx/ps/__init__.py
@@ -5,7 +5,7 @@ import subprocess
 from rwx import txt
 
 
-def get_tuples_args(*items: str | tuple[str]) -> list[str]:
+def get_tuples_args(*items: str | tuple[str, ...]) -> list[str]:
     """Turn arguments tuples into an arguments list."""
     args: list[str] = []
     for item in items:
@@ -16,21 +16,21 @@ def get_tuples_args(*items: str | tuple[str]) -> list[str]:
     return args
 
 
-def run(*items: str | tuple[str]) -> subprocess.CompletedProcess:
+def run(*items: str | tuple[str, ...]) -> subprocess.CompletedProcess:
     """Run from a list of arguments tuples."""
     return subprocess.run(
         get_tuples_args(*items), capture_output=False, check=True
     )
 
 
-def run_line(*items: str | tuple[str], charset: str = txt.CHARSET) -> str:
+def run_line(*items: str | tuple[str, ...], charset: str = txt.CHARSET) -> str:
     """Run and return output line."""
     line, *_ = run_lines(*items, charset=charset)
     return line
 
 
 def run_lines(
-    *items: str | tuple[str], charset: str = txt.CHARSET
+    *items: str | tuple[str, ...], charset: str = txt.CHARSET
 ) -> list[str]:
     """Run and return output lines."""
     process = subprocess.run(