diff --git a/BLcourse2.3/convert-to-ipynb.sh b/BLcourse2.3/convert-to-ipynb.sh
new file mode 100755
index 0000000000000000000000000000000000000000..be23e43b6e01e4ad115436765c007a8a12c78684
--- /dev/null
+++ b/BLcourse2.3/convert-to-ipynb.sh
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+for fn in 0*dim.py; do
+    jupytext --to ipynb $fn
+done