diff --git a/samples/certs/clientA.sh b/samples/certs/clientA.sh
index 118e186..0f0657d 100755
--- a/samples/certs/clientA.sh
+++ b/samples/certs/clientA.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -sha256 -keyout clientAkey.pem -out clientAreq.pem \
   -nodes -config ./clientA.cnf -days 365 -batch
diff --git a/samples/certs/clientB.sh b/samples/certs/clientB.sh
index a39ae83..8718468 100755
--- a/samples/certs/clientB.sh
+++ b/samples/certs/clientB.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -sha256 -keyout clientBkey.pem -out clientBreq.pem \
   -nodes -config ./clientB.cnf -days 365 -batch
diff --git a/samples/certs/rootA.sh b/samples/certs/rootA.sh
index fcfcd73..6d29126 100755
--- a/samples/certs/rootA.sh
+++ b/samples/certs/rootA.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -sha256 -keyout rootAkey.pem -out rootAreq.pem -nodes -config ./rootA.cnf -days 365 -batch
 
diff --git a/samples/certs/rootB.sh b/samples/certs/rootB.sh
index 07b53a4..fabc3a5 100755
--- a/samples/certs/rootB.sh
+++ b/samples/certs/rootB.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -sha256 -keyout rootBkey.pem -out rootBreq.pem -nodes -config ./rootB.cnf -days 365 -batch
 
diff --git a/samples/certs/serverA.sh b/samples/certs/serverA.sh
index ac2b09d..66e8441 100755
--- a/samples/certs/serverA.sh
+++ b/samples/certs/serverA.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -keyout serverAkey.pem -out serverAreq.pem \
    -config ./serverA.cnf -nodes -days 365 -batch
diff --git a/samples/certs/serverB.sh b/samples/certs/serverB.sh
index 091f1ac..ee127ea 100755
--- a/samples/certs/serverB.sh
+++ b/samples/certs/serverB.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl req -newkey rsa:2048 -keyout serverBkey.pem -out serverBreq.pem \
    -config ./serverB.cnf -nodes -days 365 -batch
diff --git a/samples/key/genkey.sh b/samples/key/genkey.sh
old mode 100644
new mode 100755
index 33881cf..f6065c3
--- a/samples/key/genkey.sh
+++ b/samples/key/genkey.sh
@@ -1,3 +1,3 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 openssl genrsa -des3 -out key.pem -passout pass:foobar 2048
diff --git a/samples/multicert/gencerts.sh b/samples/multicert/gencerts.sh
index 7fc851d..6bba12b 100755
--- a/samples/multicert/gencerts.sh
+++ b/samples/multicert/gencerts.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 
 mkdir -p certs