diff --git a/xCAT-server-2.0/share/xcat/install/scripts/pre.rh b/xCAT-server-2.0/share/xcat/install/scripts/pre.rh
index e9e27a521..81a6f9a1c 100644
--- a/xCAT-server-2.0/share/xcat/install/scripts/pre.rh
+++ b/xCAT-server-2.0/share/xcat/install/scripts/pre.rh
@@ -1,4 +1,4 @@
-if grep n8r /proc/cmdline >& /dev/null;
+if grep n8r /proc/cmdline > /dev/null 2>&1;
 then
   stty crtscts
 fi