diff --git a/xCAT/postscripts/addsiteyum b/xCAT/postscripts/addsiteyum
index 9e980dcb3..c8b5fb1ed 100755
--- a/xCAT/postscripts/addsiteyum
+++ b/xCAT/postscripts/addsiteyum
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 cd `dirname $0`
 if [ ! -d repos/$OSVER/$ARCH ];  then
    logger -t xcat -p local4.err "addsiteyum: repos/$OSVER/$ARCH is not a directory"
diff --git a/xCAT/postscripts/chef-client b/xCAT/postscripts/chef-client
index 834b78f3f..8485aa837 100755
--- a/xCAT/postscripts/chef-client
+++ b/xCAT/postscripts/chef-client
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #This script will invoke the config_chef_client directly.
 #If the chef-server and chef-client are installed successfully at first,
diff --git a/xCAT/postscripts/config_chef_client b/xCAT/postscripts/config_chef_client
index 4d06eca7f..60dacd811 100755
--- a/xCAT/postscripts/config_chef_client
+++ b/xCAT/postscripts/config_chef_client
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/config_chef_server b/xCAT/postscripts/config_chef_server
index 538c737f4..d3abdc077 100755
--- a/xCAT/postscripts/config_chef_server
+++ b/xCAT/postscripts/config_chef_server
@@ -1,4 +1,4 @@
-#!/bin/sh  
+#!/bin/bash  
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/config_chef_workstation b/xCAT/postscripts/config_chef_workstation
index 885fb3f0d..0bb826af8 100755
--- a/xCAT/postscripts/config_chef_workstation
+++ b/xCAT/postscripts/config_chef_workstation
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/config_puppet_client b/xCAT/postscripts/config_puppet_client
index 3bea76930..5442f2e98 100755
--- a/xCAT/postscripts/config_puppet_client
+++ b/xCAT/postscripts/config_puppet_client
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/config_puppet_server b/xCAT/postscripts/config_puppet_server
index fff6373c4..d0e01fd7e 100755
--- a/xCAT/postscripts/config_puppet_server
+++ b/xCAT/postscripts/config_puppet_server
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/configib b/xCAT/postscripts/configib
index 3637cfb25..2cfebb470 100755
--- a/xCAT/postscripts/configib
+++ b/xCAT/postscripts/configib
@@ -1,4 +1,4 @@
-#!/bin/sh 
+#!/bin/bash 
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 # Internal script used by confignics only
 # xCAT post script for configuring ib adapters.
diff --git a/xCAT/postscripts/install_chef_client b/xCAT/postscripts/install_chef_client
index 69e799e39..ad6342b79 100755
--- a/xCAT/postscripts/install_chef_client
+++ b/xCAT/postscripts/install_chef_client
@@ -1,4 +1,4 @@
-#!/bin/sh 
+#!/bin/bash 
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 #####################################################
 #=head1  install_chef_client
diff --git a/xCAT/postscripts/install_chef_server b/xCAT/postscripts/install_chef_server
index 7af79efa4..8ccaa87fd 100755
--- a/xCAT/postscripts/install_chef_server
+++ b/xCAT/postscripts/install_chef_server
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 #####################################################
 #=head1  install_chef_server
diff --git a/xCAT/postscripts/install_chef_workstation b/xCAT/postscripts/install_chef_workstation
index 8823ebe19..38098613a 100755
--- a/xCAT/postscripts/install_chef_workstation
+++ b/xCAT/postscripts/install_chef_workstation
@@ -1,4 +1,4 @@
-#!/bin/sh 
+#!/bin/bash 
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 #####################################################
 #=head1  install_chef_client
diff --git a/xCAT/postscripts/install_puppet_client b/xCAT/postscripts/install_puppet_client
index be30f15f7..24baca49b 100755
--- a/xCAT/postscripts/install_puppet_client
+++ b/xCAT/postscripts/install_puppet_client
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/install_puppet_server b/xCAT/postscripts/install_puppet_server
index 8c399ebb4..086797a6d 100755
--- a/xCAT/postscripts/install_puppet_server
+++ b/xCAT/postscripts/install_puppet_server
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 
diff --git a/xCAT/postscripts/ospkgs b/xCAT/postscripts/ospkgs
index 2b1fc480d..c3c0e8c91 100755
--- a/xCAT/postscripts/ospkgs
+++ b/xCAT/postscripts/ospkgs
@@ -1,4 +1,4 @@
-#!/bin/sh  
+#!/bin/bash  
 # IBM(c) 2010 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 #-------------------------------------------------------------------------------
diff --git a/xCAT/postscripts/otherpkgs b/xCAT/postscripts/otherpkgs
index d851b493c..69099a94f 100755
--- a/xCAT/postscripts/otherpkgs
+++ b/xCAT/postscripts/otherpkgs
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 #-------------------------------------------------------------------------------
diff --git a/xCAT/postscripts/remoteshell b/xCAT/postscripts/remoteshell
index 0157d3584..b5778c9df 100755
--- a/xCAT/postscripts/remoteshell
+++ b/xCAT/postscripts/remoteshell
@@ -1,4 +1,4 @@
-#!/bin/sh 
+#!/bin/bash 
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #(C)IBM Corp
 #  This script adds xCAT specific setup to the /etc/ssh/sshd_config and ssh_config file
diff --git a/xCAT/postscripts/setbootfromdisk b/xCAT/postscripts/setbootfromdisk
index 13b45c94f..251f0608c 100755
--- a/xCAT/postscripts/setbootfromdisk
+++ b/xCAT/postscripts/setbootfromdisk
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2010 EPL license http://www.eclipse.org/legal/epl-v10.html
 #(C)IBM Corp
 
diff --git a/xCAT/postscripts/setupesx b/xCAT/postscripts/setupesx
index 40fe21f54..ed785c2ff 100755
--- a/xCAT/postscripts/setupesx
+++ b/xCAT/postscripts/setupesx
@@ -47,7 +47,7 @@ fi
 # create a script that will launch the first time ESX does and configure
 # the network
 cat >/tmp/esxcfg.sh <<EOF1
-#!/bin/sh
+#!/bin/bash
 # Configure ESX Server.  You'll need to put your own IP address
 # in here. We assume eth0 is your nic.  Change if needed.
 NIC=eth0
diff --git a/xCAT/postscripts/setupntp b/xCAT/postscripts/setupntp
index 87313cdf6..f6191f25c 100755
--- a/xCAT/postscripts/setupntp
+++ b/xCAT/postscripts/setupntp
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #
 #---------------------------------------------------------------------------
diff --git a/xCAT/postscripts/setupscratch b/xCAT/postscripts/setupscratch
index 26a6a0e04..49878809c 100755
--- a/xCAT/postscripts/setupscratch
+++ b/xCAT/postscripts/setupscratch
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 #
 # This postscript sets up a scratch area on the local disk for stateless
diff --git a/xCAT/postscripts/sudoer b/xCAT/postscripts/sudoer
index 4306413f2..e30b3e03b 100755
--- a/xCAT/postscripts/sudoer
+++ b/xCAT/postscripts/sudoer
@@ -1,4 +1,4 @@
-#!/bin/sh 
+#!/bin/bash 
 # IBM(c) 2013 EPL license http://www.eclipse.org/legal/epl-v10.html
 #------------------------------------------------------------------------------
 #
diff --git a/xCAT/postscripts/syslog b/xCAT/postscripts/syslog
index 974322ace..a588b82d3 100755
--- a/xCAT/postscripts/syslog
+++ b/xCAT/postscripts/syslog
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 
 #-------------------------------------------------------------------------------
diff --git a/xCAT/postscripts/xcatclient b/xCAT/postscripts/xcatclient
index be8b6357f..7f600ea8f 100755
--- a/xCAT/postscripts/xcatclient
+++ b/xCAT/postscripts/xcatclient
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #(C)IBM Corp
 #
diff --git a/xCAT/postscripts/xcatinstallpost b/xCAT/postscripts/xcatinstallpost
index 784721c32..9e5026fcc 100755
--- a/xCAT/postscripts/xcatinstallpost
+++ b/xCAT/postscripts/xcatinstallpost
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #################################################################
 #
diff --git a/xCAT/postscripts/xcatserver b/xCAT/postscripts/xcatserver
index b4886e412..a9df7d408 100755
--- a/xCAT/postscripts/xcatserver
+++ b/xCAT/postscripts/xcatserver
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #(C)IBM Corp
 # This scripts transfers the cfgloc files and the xCAT credentials from