diff --git a/xCAT/postscripts/syslog b/xCAT/postscripts/syslog
index 49ad33fcc..358c825c1 100755
--- a/xCAT/postscripts/syslog
+++ b/xCAT/postscripts/syslog
@@ -36,26 +36,33 @@ config_Rsyslog_C3()
 
   if [ ! -f $2.XCATORIG ]; then
     cp -f $2 $2.XCATORIG
+  else
+    cat $2 > $2.XCATORIG
   fi
 
   grep "xCAT settings" $conf_file 2>&1 1> /dev/null
   if [ $? -eq 0 ]; then
-       sed -i "/# xCAT settings/,$ d" $2
+       sed "/# xCAT settings/,$ d" $2 >/tmp/sed.tmp
+       cat /tmp/sed.tmp >$2
   fi
 
   echo "# xCAT settings" >> $2
   #enable to receive remote logging
   if [ $isReceiving -eq 1 ]; then
-      sed -i 's/^\#\(\s\)*\$ModLoad\(\s\)*imudp.so/\$ModLoad imudp.so/' $2
-      sed -i 's/^\#\(\s\)*\$UDPServerRun/\$UDPServerRun/' $2
+      sed 's/^\#\(\s\)*\$ModLoad\(\s\)*imudp.so/\$ModLoad imudp.so/' $2 >/tmp/sed.tmp
+      cat /tmp/sed.tmp >$2
+      sed 's/^\#\(\s\)*\$UDPServerRun/\$UDPServerRun/' $2 >/tmp/sed.tmp
+      cat /tmp/sed.tmp >$2
   fi
 
   #enable to send the logging to master
   if [ $isLocal -eq 1 ]; then
        touch  /var/log/messages  
   else
-      sed -i 's/^\(\*\..*\)/\#\1/' $2  
-      sed -i 's/^\(news\|local7\|mail\|authpriv\|cron\|kern\)\./\#\1\./' $2  
+      sed 's/^\(\*\..*\)/\#\1/' $2 >/tmp/sed.tmp
+      cat /tmp/sed.tmp >$2
+      sed 's/^\(news\|local7\|mail\|authpriv\|cron\|kern\)\./\#\1\./' $2 >/tmp/sed.tmp 
+      cat /tmp/sed.tmp >$2
       echo "*.* @$master" >> $2
   fi 
 }
@@ -67,7 +74,7 @@ if [[ $NTYPE = service ]]; then
 fi
 
 if [[ $OSTYPE = linux* ]]; then
-  if [[ $OSVER = fedora* ]] || [[ $OSVER = rhels5* ]] || [[ -f /etc/fedora-release ]]; then
+  if [[ $OSVER = fedora* ]] || [[ $OSVER = rhels5* ]] || [[ $OSVER = rhel6* ]] || [[ $OSVER = rhels6* ]] || [[ -f /etc/fedora-release ]]; then
     if [ -e /etc/rsyslog.conf ]; then
       conf_file="/etc/rsyslog.conf"
       sysconfig="/etc/sysconfig/rsyslog"
@@ -145,7 +152,8 @@ if [ $ng -eq 1 ]; then
     if [ ! -f $conf_file.XCATORIG ];  then
        cp -f $conf_file $conf_file.XCATORIG
     fi
-    sed -i 's/#udp(ip("0.0.0.0/udp(ip("0.0.0.0/' $conf_file
+    sed 's/#udp(ip("0.0.0.0/udp(ip("0.0.0.0/' $conf_file >/tmp/sed.tmp
+    cat /tmp/sed.tmp >$conf_file
   fi
 fi
 
@@ -176,7 +184,8 @@ else
 
       grep "xCAT settings" $conf_file 2>&1 1> /dev/null
       if [ $? -eq 0 ]; then
-	  sed -i "/# xCAT settings/,$ d" $conf_file
+	  sed "/# xCAT settings/,$ d" $conf_file >/tmp/sed.tmp
+      cat /tmp/sed.tmp >$conf_file
       fi
 
       if [ $isLinux -eq 0 ]; then # aix
@@ -192,7 +201,8 @@ else
       fi
       grep "xCAT settings" $conf_file 2>&1 1> /dev/null
       if [ $? -eq 0 ]; then
-	  sed -i "/# xCAT settings/,$ d" $conf_file
+	  sed "/# xCAT settings/,$ d" $conf_file >/tmp/sed.tmp
+      cat /tmp/sed.tmp >$conf_file
       fi
       echo "# xCAT settings" >> $conf_file
       echo "destination loghost { udp(\"$master\"); };" >> $conf_file