diff --git a/recipes-support/nmhw-auto-part/nmhw-auto-part/nmhw-auto-part b/recipes-support/nmhw-auto-part/nmhw-auto-part/nmhw-auto-part
index 3eb43d8..6c92146 100644
--- a/recipes-support/nmhw-auto-part/nmhw-auto-part/nmhw-auto-part
+++ b/recipes-support/nmhw-auto-part/nmhw-auto-part/nmhw-auto-part
@@ -7,17 +7,18 @@
 # $3 = 'data' or 'overlay' type of partition to append
 # $4 = size of the appended partition in MB (set to 0 to fill)
 
-red="\e[31m"
+
 green="\e[32m"
-underlined="\e[4m"
 normal="\e[0m"
 bold="\e[1m"
 
 device_available(){
   local device=$1
   if [ -e $device ] ; then
-    local partdevice_first=$(ls $device*[1-9] | tail -n 1)
-    local partn_first=${partdevice_first: -1}
+    local partdevice_first
+    partdevice_first=$(ls $device*[1-9] | tail -n 1)
+    local partn_first
+    partn_first=${partdevice_first: -1}
     if (( $partn_first > 1 )) ; then
       echo "Error: Device $device has already too many partitions."
       echo "Please use this script only once."
@@ -35,7 +36,8 @@ rootsize_ok(){
   local devicename=$1
   local partname=$2
   local newsize=$3
-  local size=$(( $(cat /sys/block/$devicename/$partname/size) * $(cat /sys/block/$devicename/queue/hw_sector_size) / 1024 / 1024 ))
+  local size
+  size=$(( $(cat /sys/block/$devicename/$partname/size) * $(cat /sys/block/$devicename/queue/hw_sector_size) / 1024 / 1024 ))
 
   if [ $newsize -eq 0 ] ; then
     return 0
@@ -79,29 +81,32 @@ expand_partition(){
   fi
 
   # Get the partiton device e.g. /dev/mmcblk1p2
-  local partdevice=$(ls $device*[$partn] | tail -n 1)
+  local partdevice
+  partdevice=$(ls $device*[$partn] | tail -n 1)
 
   # get the name e.g. mmcblk1
-  local devicename=$(echo $device | cut -d '/' -f 3)
+  local devicename
+  devicename=$(echo $device | cut -d '/' -f 3)
 
   # get the name of the otaroot partition e.g. mmcblk1p2
-  local partname=$(echo $partdevice | cut -d '/' -f 3)
+  local partname
+  partname=$(echo $partdevice | cut -d '/' -f 3)
 
   # first sector
-  local start=$(cat /sys/block/$devicename/$partname/start)
+  local start
+  start=$(cat /sys/block/$devicename/$partname/start)
 
   # last sector
-  local end=$(($start+$(cat /sys/block/$devicename/$partname/size)))
+  local end
+  end=$(($start+$(cat /sys/block/$devicename/$partname/size)))
 
   # calculate new last sector
-  local newend=$(($start + $newsize * 1024 * 1024 / $(cat /sys/block/$devicename/queue/hw_sector_size)))
-
-  # calculate current size
-  local currentsize=$(( $(cat /sys/block/$devicename/$partname/size) / 1024 / 1024 * $(cat /sys/block/$devicename/queue/hw_sector_size) ))
+  local newend
+  newend=$(($start + $newsize * 1024 * 1024 / $(cat /sys/block/$devicename/queue/hw_sector_size)))
 
   echo -e "d\n$partn\nn\np\n$partn\n$start\n$newend\nw\n" | fdisk $device > /dev/null 2>&1
-  partprobe $device > /dev/null 2>&1
-  resize2fs $partdevice > /dev/null 2>&1
+  partprobe $device >> /var/log/nmhw-auto-part.log 2>&1 || true
+  resize2fs $partdevice >> /var/log/nmhw-auto-part.log 2>&1
 }
 
 
@@ -114,31 +119,40 @@ append_partition(){
   local size=$2
 
   # Get the previous partiton device e.g. /dev/mmcblk1p2
-  local partdevice_prev=$(ls $device*[1-9] | tail -n 1)
-  local partn_prev=${partdevice_prev: -1}
+  local partdevice_prev
+  partdevice_prev=$(ls $device*[1-9] | tail -n 1)
+  local partn_prev
+  partn_prev=${partdevice_prev: -1}
 
   if [ $partn_prev -eq 4 ] ; then
     echo "Error:You can only have a maximum of 4 partitions."
     return 1
   fi
 
-  local partn=$(($partn_prev + 1))
+  local partn
+  partn=$(($partn_prev + 1))
 
   # get the name e.g. mmcblk1
-  local devicename=$(echo $device | cut -d '/' -f 3)
+  local devicename
+  devicename=$(echo $device | cut -d '/' -f 3)
 
   # get the name of the previous partition e.g. mmcblk1p2
-  local partname_prev=$(echo $partdevice_prev | cut -d '/' -f 3)
+  local partname_prev
+  partname_prev=$(echo $partdevice_prev | cut -d '/' -f 3)
 
   # first sector
-  local start_prev=$(cat /sys/block/$devicename/$partname_prev/start)
+  local start_prev
+  start_prev=$(cat /sys/block/$devicename/$partname_prev/start)
 
   # last sector of previous partition
-  local end_prev=$(($start_prev+$(cat /sys/block/$devicename/$partname_prev/size)))
+  local end_prev
+  end_prev=$(($start_prev+$(cat /sys/block/$devicename/$partname_prev/size)))
 
-  local start=$(($end_prev + 1))
+  local start
+  start=$(($end_prev + 1))
 
-  local end_device=$(($(cat /sys/block/$devicename/size)-8))
+  local end_device
+  end_device=$(($(cat /sys/block/$devicename/size)-8))
 
   if [ $size -eq 0 ] ; then
     local end=$end_device
@@ -150,11 +164,12 @@ append_partition(){
   fi
 
   echo -e "n\np\n$partn\n$start\n$end\nw\n" | fdisk $device > /dev/null 2>&1
-  partprobe $device > /dev/null 2>&1
+  partprobe $device >> /var/log/nmhw-auto-part.log 2>&1 || true
 
   # Get the partiton device e.g. /dev/mmcblk1p2
-  local partdevice=$(ls $device*[$partn] | tail -n 1)
-  mkfs.ext4 $partdevice > /dev/null 2>&1
+  local partdevice
+  partdevice=$(ls $device*[$partn] | tail -n 1)
+  mkfs.ext4 $partdevice >> /var/log/nmhw-auto-part.log 2>&1
 
   createdPartition=$partdevice
 }
@@ -166,15 +181,15 @@ interactive_mode(){
   printf "|$bold It's advised, that you use the recommended values in the$green [square brackets]$normal.\n"
   printf "|$bold Press enter to automatically apply the recommended values.$normal\n"
 
-  false
-  while ! [ $? -eq 0 ]; do
+  d=0
+  while [ $d -eq 0 ]; do
     printf "Input device to expand $bold$green[/dev/mmcblk1]$normal:\n"
     read device
     if [ -z ${device} ] ; then
       device="/dev/mmcblk1"
       printf "Using $device\n"
     fi
-    device_available $device
+    device_available $device && d=1
   done
 
   # number of the otaroot partiton
@@ -189,26 +204,26 @@ interactive_mode(){
   # get the name of the otaroot partition e.g. mmcblk1p2
   otarootpartname=$(echo $otarootpart | cut -d '/' -f 3)
 
-  false
-  while ! [ $? -eq 0 ]; do
+  d=0
+  while [ $d -eq 0 ]; do
     printf "Input size of the otaroot in MB $bold$green[1024]$normal:\n"
     read newrootsize
     if [ -z ${newrootsize} ] ; then
       newrootsize="1024"
       printf "Using $newrootsize\n"
     fi
-    rootsize_ok $devicename $otarootpartname $newrootsize
+    rootsize_ok $devicename $otarootpartname $newrootsize && d=1
   done
 
-  false
-  while ! [ $? -eq 0 ] ; do
+  d=0
+  while [ $d -eq 0 ] ; do
     printf "Input type of partition to append ('data' or 'overlay') $bold$green[overlay]$normal:\n"
     read ptype
     if [ -z ${ptype} ] ; then
       ptype="overlay"
       printf "Using $ptype\n"
     fi
-    type_available $ptype
+    type_available $ptype && d=1
   done
 
   printf "Size of the appended partition in MB (set to 0 to fill) $bold$green[0]$normal:\n"
@@ -260,24 +275,26 @@ execute(){
   append_partition $device $datasize
   datapart=$createdPartition
 
-  mkdir -p /data
   mount $datapart /mnt
   echo "$datapart       /mnt          auto       defaults,sync  0  0" >> /etc/fstab
 
   case "$ptype" in
   "data")
-      mkdir /mnt/data
+      mkdir -p /mnt/data
       ;;
   "overlay")
       mkdir -p /mnt/.work
       mkdir -p /mnt/overlay
-      systemctl enable mount-overlay.service > /dev/null 2>&1
+      systemctl enable mount-overlay.service >> /var/log/nmhw-auto-part.log 2>&1
       systemctl start mount-overlay.service
       ;;
   *)
       echo "Error: $ptype is not an option."
       ;;
   esac
+
+  echo "Partitioning successful."
+  echo "Partitioning successful." >> /var/log/nmhw-auto-part.log
 }
 
 usage(){
@@ -298,6 +315,14 @@ description(){
   -h help\n"
 }
 
+# exit when any commands fails
+set -e
+
+echo "Script started $(date)." >> /var/log/nmhw-auto-part.log
+echo "Script run with parameters 1: $1 2: $2 3: $3 4: $4 5: $5" >> /var/log/nmhw-auto-part.log
+echo "" >> /var/log/nmhw-auto-part.log
+echo "" >> /var/log/nmhw-auto-part.log
+
 if (( $# == 1 )) ; then
   case $1 in
   "-i")