diff --git a/xCAT-server/share/xcat/ib/scripts/Mellanox/mlnxofed_ib_install.v2 b/xCAT-server/share/xcat/ib/scripts/Mellanox/mlnxofed_ib_install.v2
index efc81f1d3..eaa73cd09 100644
--- a/xCAT-server/share/xcat/ib/scripts/Mellanox/mlnxofed_ib_install.v2
+++ b/xCAT-server/share/xcat/ib/scripts/Mellanox/mlnxofed_ib_install.v2
@@ -172,7 +172,7 @@ function cleanup()
     local -i max_retry=99
 	
     if [ "$NODESETSTATE" != "genimage" ]; then
-        if mount | grep "/tmp/ofed/mountpoint"; then
+        if mount | grep -q "/tmp/ofed/mountpoint"; then
             while ! umount "/tmp/ofed/mountpoint"
             do
                 (( ++i > max_retry )) && echo "Umount /tmp/ofed/mountpoint failed" >&2 && break
@@ -189,7 +189,7 @@ function cleanup()
         fi
 
         # Clean up the ofed iso
-        if mount | grep "$IMGROOTPATH/tmp/ofed/mountpoint"; then
+        if mount | grep -q "$IMGROOTPATH/tmp/ofed/mountpoint"; then
             while ! umount "$IMGROOTPATH/tmp/ofed/mountpoint"
             do
                 (( ++i > max_retry )) && echo "Umount $IMGROOTPATH/tmp/ofed/mountpoint failed" >&2 && break
@@ -201,7 +201,7 @@ function cleanup()
         fi
 		
         i=0
-        if mount | grep "$IMGROOTPATH/sys"; then
+        if mount | grep -q "$IMGROOTPATH/sys"; then
             while ! umount "$IMGROOTPATH/sys"
             do 
                 (( ++i > max_retry )) && echo "Umount $IMGROOTPATH/sys failed" >&2 && break
@@ -209,7 +209,7 @@ function cleanup()
             done
         fi 
         i=0
-        if mount | grep "$IMGROOTPATH/proc"; then
+        if mount | grep -q "$IMGROOTPATH/proc"; then
             while ! umount "$IMGROOTPATH/proc"
             do
                 (( ++i > max_retry )) && echo "Umount $IMGROOTPATH/proc failed" >&2 && break
@@ -217,7 +217,7 @@ function cleanup()
             done
         fi 
         i=0
-        if mount | grep "$IMGROOTPATH/dev"; then
+        if mount | grep -q "$IMGROOTPATH/dev"; then
             while ! umount "$IMGROOTPATH/dev"
             do
                 (( ++i > max_retry )) && echo "Umount $IMGROOTPATH/dev failed" >&2 && break