tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/tools/bitesize.py b/tools/bitesize.py
index e57185d..f70f091 100755
--- a/tools/bitesize.py
+++ b/tools/bitesize.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 #
 # bitehist.py   Block I/O size histogram.
 #               For Linux, uses BCC, eBPF. See .c file.