diff --git a/ext-to-sh b/ext-to-sh
new file mode 100644
index 0000000..0dd85bf
--- /dev/null
+++ b/ext-to-sh
@@ -0,0 +1,23 @@
+#!/usr/bin/sh
+
+# ext-to-sh
+# This script changes the extension of the files from ksh to sh
+# Copyright (C) 2020  Scott C. MacCallum
+# scm@sdf.org
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+find . -name "*.ksh" -exec sh -c 'mv "$1" "${1%.ksh}.sh"' _ {} \;
+
+exit 0