diff --git a/tools/create_userrc.sh b/tools/create_userrc.sh
index de44abb..25f713c 100755
--- a/tools/create_userrc.sh
+++ b/tools/create_userrc.sh
@@ -190,7 +190,8 @@
     local user_passwd=$5
 
     # The admin user can see all user's secret AWS keys, it does not looks good
-    local line=`openstack ec2 credentials list --user $user_id | grep " $project_id "`
+    local line
+    line=$(openstack ec2 credentials list --user $user_id | grep " $project_id " || true)
     if [ -z "$line" ]; then
         openstack ec2 credentials create --user $user_id --project $project_id 1>&2
         line=`openstack ec2 credentials list --user $user_id | grep " $project_id "`
diff --git a/tools/peakmem_tracker.sh b/tools/peakmem_tracker.sh
index 0d5728a..ecbd79a 100755
--- a/tools/peakmem_tracker.sh
+++ b/tools/peakmem_tracker.sh
@@ -41,10 +41,12 @@
 # snapshot of current usage; i.e. checking the latest entry in the
 # file will give the peak-memory usage
 function tracker {
-    local low_point=$(get_mem_available)
+    local low_point
+    low_point=$(get_mem_available)
     while [ 1 ]; do
 
-        local mem_available=$(get_mem_available)
+        local mem_available
+        mem_available=$(get_mem_available)
 
         if [[ $mem_available -lt $low_point ]]; then
             low_point=$mem_available
diff --git a/tools/xen/scripts/install-os-vpx.sh b/tools/xen/scripts/install-os-vpx.sh
index 1ebbeaf..66f7ef4 100755
--- a/tools/xen/scripts/install-os-vpx.sh
+++ b/tools/xen/scripts/install-os-vpx.sh
@@ -100,7 +100,8 @@
 {
     local v="$1"
     echo "Installing VM interface on [$BRIDGE]"
-    local out_network_uuid=$(find_network "$BRIDGE")
+    local out_network_uuid
+    out_network_uuid=$(find_network "$BRIDGE")
     xe vif-create vm-uuid="$v" network-uuid="$out_network_uuid" device="0"
 }
 
diff --git a/tools/xen/scripts/uninstall-os-vpx.sh b/tools/xen/scripts/uninstall-os-vpx.sh
index 1ed2494..96dad7e 100755
--- a/tools/xen/scripts/uninstall-os-vpx.sh
+++ b/tools/xen/scripts/uninstall-os-vpx.sh
@@ -35,9 +35,12 @@
 destroy_vdi()
 {
     local vbd_uuid="$1"
-    local type=$(xe_min vbd-list uuid=$vbd_uuid params=type)
-    local dev=$(xe_min vbd-list uuid=$vbd_uuid params=userdevice)
-    local vdi_uuid=$(xe_min vbd-list uuid=$vbd_uuid params=vdi-uuid)
+    local type
+    type=$(xe_min vbd-list uuid=$vbd_uuid params=type)
+    local dev
+    dev=$(xe_min vbd-list uuid=$vbd_uuid params=userdevice)
+    local vdi_uuid
+    vdi_uuid=$(xe_min vbd-list uuid=$vbd_uuid params=vdi-uuid)
 
     if [ "$type" == 'Disk' ] && [ "$dev" != 'xvda' ] && [ "$dev" != '0' ]; then
         xe vdi-destroy uuid=$vdi_uuid
@@ -47,7 +50,8 @@
 uninstall()
 {
     local vm_uuid="$1"
-    local power_state=$(xe_min vm-list uuid=$vm_uuid params=power-state)
+    local power_state
+    power_state=$(xe_min vm-list uuid=$vm_uuid params=power-state)
 
     if [ "$power_state" != "halted" ]; then
         xe vm-shutdown vm=$vm_uuid force=true
diff --git a/tools/xen/test_functions.sh b/tools/xen/test_functions.sh
index 924e773..324e6a1 100755
--- a/tools/xen/test_functions.sh
+++ b/tools/xen/test_functions.sh
@@ -165,7 +165,8 @@
 function test_get_local_sr {
     setup_xe_response "uuid123"
 
-    local RESULT=$(. mocks && get_local_sr)
+    local RESULT
+    RESULT=$(. mocks && get_local_sr)
 
     [ "$RESULT" == "uuid123" ]
 
@@ -173,7 +174,8 @@
 }
 
 function test_get_local_sr_path {
-    local RESULT=$(mock_out get_local_sr "uuid1" && get_local_sr_path)
+    local RESULT
+    RESULT=$(mock_out get_local_sr "uuid1" && get_local_sr_path)
 
     [ "/var/run/sr-mount/uuid1" == "$RESULT" ]
 }