diff --git a/aider/diffs.py b/aider/diffs.py
index e69de29bb..621d60c4c 100644
--- a/aider/diffs.py
+++ b/aider/diffs.py
@@ -0,0 +1,23 @@
+import sys
+import difflib
+
+def main():
+    if len(sys.argv) != 3:
+        print("Usage: python diffs.py file1 file2")
+        sys.exit(1)
+
+    file1, file2 = sys.argv[1], sys.argv[2]
+
+    with open(file1, 'r') as f1:
+        content1 = f1.readlines()
+
+    with open(file2, 'r') as f2:
+        content2 = f2.readlines()
+
+    differences = list(difflib.unified_diff(content1, content2, fromfile=file1, tofile=file2))
+
+    for line in differences:
+        sys.stdout.write(line)
+
+if __name__ == "__main__":
+    main()