diff --git a/libwyag.py b/libwyag.py
index 438f6ac..33b5b79 100644
--- a/libwyag.py
+++ b/libwyag.py
@@ -48,7 +48,7 @@ class GitRepository (object):
     conf = None
 
     def __init__(self, path, force=False):
-        self.worktree = path
+        self.worktree = path.replace("\\", "/")
         self.gitdir = join_path(path, ".git")
 
         if not (force or os.path.isdir(self.gitdir)):
@@ -1197,3 +1197,97 @@ def cmd_status_index_worktree(repo, index):
         # its name without its contents.
         if not check_ignore(ignore, f):
             print(" ", f)
+
+def index_write(repo, index):
+    with open(GitRepository.repo_file(repo, "index"), "wb") as f:
+
+        # Header
+
+        # Magic bytes which identify the file type.
+        f.write(b"DIRC")
+        f.write(index.version.to_bytes(4, "big"))
+        f.write(len(index.entries).to_bytes(4, "big"))
+
+        # Entries
+
+        idx = 0
+        for e in index.entries:
+            f.write(e.ctime[0].to_bytes(4, "big"))
+            f.write(e.ctime[1].to_bytes(4, "big"))
+            f.write(e.mtime[0].to_bytes(4, "big"))
+            f.write(e.mtime[1].to_bytes(4, "big"))
+            f.write(e.dev.to_bytes(4, "big"))
+            f.write(e.ino.to_bytes(4, "big"))
+
+            mode = (e.mode_type << 12) | e.mode_perms
+            f.write(mode.to_bytes(4, "big"))
+
+            f.write(e.uid.to_bytes(4, "big"))
+            # FIXME: Convert back to int.
+            f.write(int(e.sha, 16).to_bytes(20, "big"))
+
+            flag_assume_valid = 0x1 << 15 if e.flag_assume_valid else 0
+
+            name_bytes = e.name.encode("utf8")
+            bytes_len = len(name_bytes)
+            if bytes_len >= 0xFFF:
+                name_length = 0xFFF
+            else:
+                name_length = bytes_len
+
+            f.write((flag_assume_valid | e.flag_stage | name_length).to_bytes(2, "big"))
+
+            f.write(name_bytes)
+            # Null-terminate the name string
+            f.write((0).to_bytes(1, "big"))
+
+            idx += 62 + len(name_bytes) + 1
+
+            # Add padding if necessary
+            if idx % 8 != 0:
+                pad = 8 - (idx % 8)
+                f.write((0).to_bytes(pad, "big"))
+                idx += pad
+
+argsp = argsubparsers.add_parser("rm", help="Remove files from the working tree and the index.")
+argsp.add_argument("path", nargs="+", help="Files to remove")
+
+def cmd_rm(args):
+    repo = repo_find()
+    rm(repo, args.path)
+
+def rm(repo, paths, delete=True, skip_missing=False):
+    index = index_read(repo)
+
+    worktree = repo.worktree.replace("\\", "/") + "/"
+
+    # Make paths absolute
+    abspaths = list()
+    for path in paths:
+        abspath = os.path.abspath(path).replace("\\", "/")
+        if abspath.startswith(worktree):
+            abspaths.append(abspath)
+        else:
+            raise Exception(f"Cannot remove paths outside of worktree: {path}")
+
+    kept_entries = list()
+    remove = list()
+
+    for e in index.entries:
+        full_path = join_path(repo.worktree, e.name)
+
+        if full_path in abspaths:
+            remove.append(full_path)
+            abspaths.remove(full_path)
+        else:
+            kept_entries.append(e)
+
+    if len(abspaths) > 0 and not skip_missing:
+        raise Exception(f"Cannot remove paths not in the index: {abspaths}")
+
+    if delete:
+        for path in remove:
+            os.unlink(path)
+
+    index.entries = kept_entries
+    index_write(repo, index)