diff --git a/xCAT-server/lib/xcat/plugins/packimage.pm b/xCAT-server/lib/xcat/plugins/packimage.pm
index f93823588..c84e12cdd 100755
--- a/xCAT-server/lib/xcat/plugins/packimage.pm
+++ b/xCAT-server/lib/xcat/plugins/packimage.pm
@@ -369,7 +369,7 @@ sub process_request {
 
     my $compress="gzip";
     #use "pigz" as the compress tool instead of gzip if "pigz" exist
-    my $ispigz=system("bash -c 'type -p pigz'");
+    my $ispigz=system("bash -c 'type -p pigz' >/dev/null 2>&1");
     if($ispigz == 0){
        $compress="pigz";
     }
@@ -385,7 +385,6 @@ sub process_request {
             if ($includestr) {
             	system("$includestr >> $xcat_packimg_tmpfile"); 
             }
-            #$excludestr =~ s!-a \z!|cpio -H newc -o | $compress -c - > ../rootimg.gz!;
             $excludestr = "cat $xcat_packimg_tmpfile|cpio -H newc -o | $compress -c - > ../rootimg.gz";
         }
         $oldmask = umask 0077;
diff --git a/xCAT-server/lib/xcat/plugins/statelite.pm b/xCAT-server/lib/xcat/plugins/statelite.pm
index 7e5ffd58c..d355d9bee 100644
--- a/xCAT-server/lib/xcat/plugins/statelite.pm
+++ b/xCAT-server/lib/xcat/plugins/statelite.pm
@@ -523,10 +523,9 @@ sub process_request {
         $callback->({data=>["$verb contents of $rootimg_dir"]});
         unlink("$destdir/rootimg-statelite.gz");
 
-
         my $compress="gzip";
         #use "pigz" as the compress tool instead of gzip if "pigz" exist
-        my $ispigz=system("bash -c 'type -p pigz'");
+        my $ispigz=system("bash -c 'type -p pigz' >/dev/null 2>&1");
         if($ispigz == 0){
            $compress="pigz";
         }
diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index e7076f58c..4fc0f4a09 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -949,14 +949,11 @@ sub mkinitrd_dracut {
 	$additional_options= qq{--include /tmp/cmdline /etc/cmdline};
     }
 
-
-
     # force the dracut run in non-hostonly mode for dracut higher than version 033
     if ($dracutver > "033") {
         $additional_options .= " -N";
     }
 
-
     #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
     my $compress=qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
     if ($compress){
@@ -964,7 +961,8 @@ sub mkinitrd_dracut {
         my $processnum=qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
         $additional_options .= " --compress \"$compress -p $processnum \"";
     }
-     print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
+
+    print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
     !system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver")
         or die("Error: failed to generate the initial ramdisk for $mode.\n");
     print "the initial ramdisk for $mode is generated successfully.\n";
diff --git a/xCAT-server/share/xcat/netboot/sles/genimage b/xCAT-server/share/xcat/netboot/sles/genimage
index 1bb216ef4..24a780a4c 100755
--- a/xCAT-server/share/xcat/netboot/sles/genimage
+++ b/xCAT-server/share/xcat/netboot/sles/genimage
@@ -1088,7 +1088,6 @@ sub mkinitrd_dracut {
         $additional_options .= " -N";
     }
 
-
     #if "pigz" is available in the rootimg, use "pigz" instead of "gzip"
     my $compress=qx(chroot $rootimg_dir bash -c "type -p pigz"|tr -d "\n");
     if ($compress){
@@ -1096,8 +1095,8 @@ sub mkinitrd_dracut {
         my $processnum=qx(lscpu -p=cpu --online|grep -v '#'|wc -l|tr -d "\n");
         $additional_options .= " --compress \"$compress -p $processnum \"";
     }
-     print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
 
+    print "\nchroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver\n";
     !system("chroot $rootimg_dir dracut $additional_options -f /tmp/initrd.$$.gz $kernelver")
         or die("Error: failed to generate the initial ramdisk for $mode.\n");
     print "the initial ramdisk for $mode is generated successfully.\n";
diff --git a/xCAT-server/share/xcat/netboot/ubuntu/genimage b/xCAT-server/share/xcat/netboot/ubuntu/genimage
index dd880ad36..f49573d3f 100755
--- a/xCAT-server/share/xcat/netboot/ubuntu/genimage
+++ b/xCAT-server/share/xcat/netboot/ubuntu/genimage
@@ -1645,17 +1645,13 @@ EOMS
     symlink("bash", "/tmp/xcatinitrd.$$/bin/sh");
     symlink("bash", "/tmp/xcatinitrd.$$/sbin/sh");
 
-
     my $compress="gzip";
     #if pigz is available,use pigz instead of gzip
     my $ispigz=system("bash -c 'type -p pigz' >/dev/null 2>&1");
     if($ispigz == 0){
        $compress="pigz";
-    }else{
-       $compress="gzip";
     }
 
-
     #copy("$rootimg_dir/lib/modules/*d","/tmp/xcatinitrd.$$/$_");
     print "\ncd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|$compress -9 -c - > $destdir/initrd-$mode.gz \n";
     system("cd /tmp/xcatinitrd.$$;find .|cpio -H newc -o|$compress -9 -c - > $destdir/initrd-$mode.gz");