use  #!/usr/bin/env bash
for portability
diff --git a/releng.control/nThreads.sh b/releng.control/nThreads.sh
index 5e65225..0feb2c8 100644
--- a/releng.control/nThreads.sh
+++ b/releng.control/nThreads.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 PIDFILE=cc.pid
 echo;
 if [ -f ${PIDFILE} ] ; then