normalize shebang lines to #!/usr/bin/env python
diff --git a/Demo/cgi/cgi1.py b/Demo/cgi/cgi1.py
index 9d25c7d..c6f3efa 100755
--- a/Demo/cgi/cgi1.py
+++ b/Demo/cgi/cgi1.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python
"""CGI test 1 - check server setup."""
diff --git a/Demo/cgi/cgi2.py b/Demo/cgi/cgi2.py
index d956f65..8026c55 100755
--- a/Demo/cgi/cgi2.py
+++ b/Demo/cgi/cgi2.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python
"""CGI test 2 - basic use of cgi module."""
diff --git a/Demo/cgi/cgi3.py b/Demo/cgi/cgi3.py
index a3421b5..6693a86 100755
--- a/Demo/cgi/cgi3.py
+++ b/Demo/cgi/cgi3.py
@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python
"""CGI test 3 (persistent data)."""