diff --git a/xCAT-server/share/xcat/install/scripts/pre.rh b/xCAT-server/share/xcat/install/scripts/pre.rh
index ee85680a1..7117fc832 100644
--- a/xCAT-server/share/xcat/install/scripts/pre.rh
+++ b/xCAT-server/share/xcat/install/scripts/pre.rh
@@ -237,7 +237,7 @@ else
 fi
 BOOTFSTYPE=ext3
 EFIFSTYPE=vfat
-if uname -r|grep ^3.*el7 > /dev/null; then
+if uname -r|grep -q '^3.*el7'; then
     FSTYPE=xfs
     BOOTFSTYPE=xfs
     EFIFSTYPE=efi
diff --git a/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7 b/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
index 94fec22d9..feddc70f2 100755
--- a/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
+++ b/xCAT-server/share/xcat/install/scripts/pre.rh.rhels7
@@ -200,7 +200,7 @@ fi
 BOOTFSTYPE=ext3
 EFIFSTYPE=vfat
 
-if uname -r|grep '^3.*el7' > /dev/null; then
+if uname -r|grep -q '^3.*el7'; then
     BOOTFSTYPE=xfs
     FSTYPE=xfs
     EFIFSTYPE=efi