diff --git a/lang/postbuild.sh b/lang/postbuild.sh
index 9218925b2..8ca5b77fc 100644
--- a/lang/postbuild.sh
+++ b/lang/postbuild.sh
@@ -30,10 +30,10 @@ LANG=$1
 IGNORE_MISSING_TEXT=1
 
 
-function finish
+finish()
 {
  echo
- if [ "$1" == "0" ]; then
+ if [ "$1" = "0" ]; then
   echo "postbuild.sh finished with success" >&2
  else
   echo "postbuild.sh finished with errors!" >&2
@@ -71,7 +71,7 @@ echo "OK" >&2
 echo -n " checking textaddr.txt..." >&2
 if cat textaddr.txt | grep "^ADDR NF" >/dev/null; then
  echo "NG! - some texts not found in lang_en.txt!"
- if [ $(("0$IGNORE_MISSING_TEXT")) -eq 0 ]; then
+ if [ $IGNORE_MISSING_TEXT -eq 0 ]; then
   finish 1
  else
   echo "  missing text ignored!" >&2
@@ -82,7 +82,7 @@ fi
 
 #update progmem1 id entries in binary file
 echo -n " extracting binary..." >&2
-$OBJCOPY -I ihex -O binary $OUTDIR/Firmware.ino.hex ./firmware.bin
+$OBJCOPY -I ihex -O binary $INOHEX ./firmware.bin
 echo "OK" >&2
 
 #update binary file
@@ -93,7 +93,7 @@ echo -n "  primary language ids..." >&2
 cat textaddr.txt | grep "^ADDR OK" | cut -f3- -d' ' | sed "s/^0000/0x/" |\
  awk '{ id = $2 - 1; hi = int(id / 256); lo = int(id - 256 * hi); printf("%d \\\\x%02x\\\\x%02x\n", strtonum($1), lo, hi); }' |\
  while read addr data; do
-  echo -n -e $data | dd of=./firmware.bin bs=1 count=2 seek=$addr conv=notrunc oflag=nonblock 2>/dev/null
+  /bin/echo -n -e $data | dd of=./firmware.bin bs=1 count=2 seek=$addr conv=notrunc oflag=nonblock 2>/dev/null
  done
 echo "OK" >&2
 
diff --git a/lang/progmem.sh b/lang/progmem.sh
index cfe62984e..5bfa56fbb 100644
--- a/lang/progmem.sh
+++ b/lang/progmem.sh
@@ -122,10 +122,10 @@ cat $PROGMEM.chr | \
  sed 's/\\x1b/\\\\\\x1b/g;' | \
  sed 's/\\x01/\\\\\\x01/g;' | \
  sed 's/\\xf8/\\\\\\xf8/g;' | \
- sed 's/\\x00$//;s/^/echo -e "/;s/$/"/' | sh > $PROGMEM.var
+ sed 's/\\x00$//;s/^/\/bin\/echo -e "/;s/$/"/' | sh > $PROGMEM.var
 
 #this step can be omitted because .txt file is not used
-#cat $PROGMEM.var | sed 's/\r/\n/g' |sed -E 's/^[0-9a-f]{8} [^ ]* //' >$PROGMEM.txt
+#cat $PROGMEM.var | sed 's/\r/\n/g' | sed -E 's/^[0-9a-f]{8} [^ ]* //' >$PROGMEM.txt
 
 echo "progmem.sh finished" >&2
 
diff --git a/lang/textaddr.sh b/lang/textaddr.sh
index abe510494..5147a41f9 100644
--- a/lang/textaddr.sh
+++ b/lang/textaddr.sh
@@ -34,7 +34,7 @@ text=''
   if [ -z "$addr" ]; then
    addr=$num
   else
-   if [ "$text" == "$txt" ]; then
+   if [ "$text" = "$txt" ]; then
     addr="$addr $num"
    else
     echo "ADDR NF $addr $text"
@@ -46,7 +46,7 @@ text=''
   if [ -z "$addr" ]; then
    echo "TEXT NF $num $txt"
   else
-   if [ "$text" == "$txt" ]; then
+   if [ "$text" = "$txt" ]; then
     if [ ${#addr} -eq 8 ]; then
      echo "ADDR OK $addr $num"
     else
diff --git a/lang/update_lang.sh b/lang/update_lang.sh
index 368dc6368..6acf9f8f9 100644
--- a/lang/update_lang.sh
+++ b/lang/update_lang.sh
@@ -13,10 +13,10 @@ LANG=$1
 if [ -z "$LANG" ]; then LANG='cz'; fi
 #
 
-function finish
+finish()
 {
  echo
- if [ "$1" == "0" ]; then
+ if [ "$1" = "0" ]; then
   echo "update_lang.sh finished with success" >&2
  else
   echo "update_lang.sh finished with errors!" >&2