diff --git a/dx2cg/disassembler.py b/dx2cg/disassembler.py
index dd85dfd..57d7aa2 100644
--- a/dx2cg/disassembler.py
+++ b/dx2cg/disassembler.py
@@ -4,6 +4,7 @@
 # ycc 08/08/2022
 
 import re
+import sys
 
 legacy = False # True for 2.6
 
@@ -281,3 +282,12 @@ def disassemble(text):
         text += vertex_footer + "\n"
     text += cg_footer
     return text
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: disassembler.py <filename>")
+    else:
+        with open(sys.argv[1], "r") as fi:
+            buf = fi.read()
+        disasm = disassemble(buf)
+        print(disasm)
diff --git a/dx2cg/main.py b/dx2cg/main.py
index 617b7fb..79e7884 100644
--- a/dx2cg/main.py
+++ b/dx2cg/main.py
@@ -29,9 +29,9 @@ def process_batch(path, suffix="_hlsl"):
 
 if __name__ == "__main__":
     if len(sys.argv) < 2:
-        print("Usage: <shader-path> [outfile-suffix]")
+        print("Usage: main.py <folder> [outfile-suffix]")
     elif len(sys.argv) == 2:
         process_batch(sys.argv[1])
     else:
-        process_batch(*sys.argv[1:2])
+        process_batch(*sys.argv[1:3])
 
diff --git a/dx2cg/swapper.py b/dx2cg/swapper.py
index a83610d..555aca1 100644
--- a/dx2cg/swapper.py
+++ b/dx2cg/swapper.py
@@ -4,6 +4,7 @@
 # ycc 08/08/2022
 
 import re
+import sys
 from disassembler import disassemble
 
 tabs = 3
@@ -14,7 +15,7 @@ def indent(block):
     return "\n".join(lines)
 
 def find_closing_bracket(block, i):
-    count = 0;
+    count = 0
     while i < len(block):
         if block[i] == '{':
             count = count + 1
@@ -62,3 +63,9 @@ def process(fn_in, fn_out):
             fo.write(processed)
         return True
     return False
+
+if __name__ == "__main__":
+    if len(sys.argv) < 3:
+        print("Usage: swapper.py <file-in> <file-out>")
+    else:
+        process(*sys.argv[1:3])