diff --git a/xCAT/postscripts/setbootfromnet b/xCAT/postscripts/setbootfromnet
index 894e3c08b..0e016715d 100755
--- a/xCAT/postscripts/setbootfromnet
+++ b/xCAT/postscripts/setbootfromnet
@@ -33,26 +33,26 @@ if [ ! -z $NODE_NAME ]; then
 else
    msg="$0: The environment variable NODE is null, pls check.\n"
    echo $msg
-   `logger -t xcat "$msg"`
+   logger -t xcat "$msg"
    exit 1 
 fi
 
 if [[ $RET -ne 0 ]] || [[ $NRET -ne 0 ]]; then
    msg="$0: The returned value is not correct, client_ip=$client_ip, nic=$nic\n"
-   `logger -t xcat "$msg"`
+   logger -t xcat "$msg"
    exit 1
 fi
 
 if [ ! -z $NIC ]; then
    if [[ ! -z $CLIENT_IP ]] && [[ ! -z $SERVER_IP ]] && [[ ! -z $GATE_WAY ]]; then
-      `bootlist -m normal $NIC bserver=$SERVER_IP gateway=$GATE_WAY client=$CLIENT_IP`
+      bootlist -m normal $NIC bserver=$SERVER_IP gateway=$GATE_WAY client=$CLIENT_IP
    else
-      `bootlist -m normal $NIC`
+      bootlist -m normal $NIC
    fi
 else
    msg="$0: The network interface NIC on the host $CLIENT_IP is not retrieved, pls check.\n"
    echo $msg
-   `logger -t xcat "$msg"`
+   logger -t xcat "$msg"
    exit 1
 fi
 
diff --git a/xCAT/postscripts/xcataixpost b/xCAT/postscripts/xcataixpost
index 316e42206..38055879b 100755
--- a/xCAT/postscripts/xcataixpost
+++ b/xCAT/postscripts/xcataixpost
@@ -260,12 +260,12 @@ if (-f $scriptname)
 # subroutine used to run postscripts
 run_ps () {
  logdir=\\"/var/log/xcat\\"
- \\\`mkdir -p \\\$logdir\\\`
+ mkdir -p \\\$logdir
  logfile=\\"/var/log/xcat/xcat.log\\"
 
  if [[ -f \\\$1 ]]; then
   echo \\"Running postscript: \\\$1\\" | tee -a \\\$logfile
-  \\\`./\\\$1 2>&1\\\` | tee -a \\\$logfile
+  ./\\\$1 2>&1 | tee -a \\\$logfile
  else
   echo \\"Postscript \\\$1 does NOT exist.\\" | tee -a \\\$logfile
  fi
diff --git a/xCAT/postscripts/xcatdsklspost b/xCAT/postscripts/xcatdsklspost
index 38b36af24..bd22b9d27 100755
--- a/xCAT/postscripts/xcatdsklspost
+++ b/xCAT/postscripts/xcatdsklspost
@@ -310,12 +310,12 @@ echo "
 # subroutine used to run postscripts
 run_ps () {
  logdir=\"var/log/xcat\"
- \`mkdir -p \$logdir\`
+ mkdir -p \$logdir
  logfile=\"var/log/xcat/xcat.log\"
  
  if [[ -f \$1 ]]; then 
   echo \"Running postscript: \$1\" | tee -a \$logfile
-  \`./\$1 2>&1\` | tee -a \$logfile
+  ./\$1 2>&1 | tee -a \$logfile
  else
   echo \"Postscript \$1 does NOT exist.\" | tee -a \$logfile
  fi