diff --git a/sequencer/sequencer.sh b/sequencer/sequencer.sh
index bf1fc19..4d39f6b 100755
--- a/sequencer/sequencer.sh
+++ b/sequencer/sequencer.sh
@@ -37,7 +37,8 @@ helpSequencer() {
   echo "  --version     : Display version of sequencer and revision of sequence"
   echo 
   echo " [STEP NUMBER\"(s)\" 1-${MAX_STEP} or ALIAS]"
-  echo "     Single STEP or ALIAS : starting point of process"
+  echo "        No STEP  or ALIAS : assume 1 as starting point"
+  echo "    Single STEP  or ALIAS : starting point of sequential process"
   echo "  Multiple STEPS or ALIAS : execute only given steps"
   echo "                            execute only one step with using special step 0"
   echo "                            ( e.g. only execute step 4: $0 \"4 0\" )"
@@ -58,7 +59,7 @@ endCheckEmpty() {
     errorText=$2
   fi
   if [ -z $ref ] ; then
-    echo -e "[Error] $errorText must not be empty.\nAborting installation."
+    echo -e " [E] $errorText must not be empty.\nAborting installation."
     exit 666
   fi 
 }
@@ -80,13 +81,13 @@ saveReturn() {
 endReturn() {
   if [[ ( $ERNO -ne 0 && $QUIET -ne 0 ) || ( $ERNO -ne 0 && ! -z $1 && $1 == "-f" ) ]] ; then
     echo
-    echo -e "[Error] Return value $ERNO detected.\nAborting installation."
+    echo -e " [E] Return value $ERNO detected.\nAborting installation."
     exit $ERNO
   fi
   if [ $ERNO -ne 0 ] ; then
     echo
-    echo "[Error] Return value $ERNO detected."
-    read -p "End installation: y(default)/n? " answer
+    echo " [E] Return value $ERNO detected."
+    read -p "End installation: [y]/n? " answer
     case $answer in
       [nN])
         echo
@@ -127,10 +128,10 @@ addConf() {
   esac
 
   if [ "$DRY" -ne 0 ] ; then
-    echo "-- Writing $3...dry-run"
+    echo " [I] Writing $3...dry-run"
     return 0;
   fi
-  echo -n "Writing $3..."
+  echo -n " [I] Writing $3..."
 
   if [ $confMode != "-m" ] ; then 
     # try writing config directly
@@ -160,7 +161,7 @@ addConf() {
         else
           echo "$2" >> "$3"
         fi
-        echo -e "ok \n[WARN] Existing config saved to ${addConfBackup}"
+        echo -e "ok \n [W] Existing config saved to ${addConfBackup}"
         return 0
       else
         echo "nok (backup exists)"
@@ -180,7 +181,7 @@ addConf() {
   echo "$2" >> "$MISSING_CONF"
   echo >> "$MISSING_CONF"
 
-  echo "[WARN] Check $(realpath "$MISSING_CONF") for configuration conflicts ($3)"
+  echo " [W] Check $(realpath "$MISSING_CONF") for configuration conflicts ($3)"
   return 1
 }
 
@@ -208,7 +209,7 @@ execute() {
     return $NOTFOUND
   fi 
 
-  echo -en "\n[STEP $1] "
+  echo -en "\n [STEP $1] "
   existsFunction step_${1}_info
   if [ $? -eq 0 ] ; then
     step_${1}_info $1
@@ -217,7 +218,7 @@ execute() {
     echo
   fi
   if [ $QUIET -ne 1 ] ; then
-    read -p "Start: y/n(default)? " answer
+    read -p "Start: y/[n]? " answer
     case $answer in
       [yY])
         step_$1 $1 "$STEP_ARGS"
@@ -237,15 +238,25 @@ execute() {
 # Check sanitiy of step number or
 # Check if alias exists
 checkStep() {
-  if (( $1 < 1 ||  $1 > $MAX_STEP )) ; then
-    eval 'local ref=$alias_'$1
-    if [ -z $ref ] || [ "$ref" == "$1" ] ; then
-      return 0 
-    else
-      return $ref
+  local rex='^[0-9]+$'
+  local ref=""
+
+  # Check if string is a number or alias 
+  if ! [[ "$1" =~ $rex ]] ; then
+    eval 'ref=$alias_'"$1"
+    # Catch special character after eval
+    if ! [[ "$ref" =~ $rex ]] ; then
+      echo " [E] Invalid step: $1"
+      ref=0
     fi
   else
-    return $1
+    ref=$1 
+  fi
+
+  if (( $ref < 1 ||  $ref > $MAX_STEP )) ; then
+    return 0 
+  else
+    return $ref
   fi
 }
 
@@ -255,7 +266,7 @@ checkStep() {
 continous() {
   local step=0
 
-  checkStep $1
+  checkStep "$1"
   step=$?
   if [[ $step == 0 ]] ; then
     return 1
@@ -277,7 +288,7 @@ selection() {
   local step=0
   local array=("$@")
   for i in ${array[@]} ; do
-    checkStep $i
+    checkStep "$i"
     step=$?
     # stop on step 0 
     if [ $step -eq 0 ] ; then
@@ -348,7 +359,7 @@ displayHelp() {
   if [ $stepsFound -eq 0 ] ; then
     echo -e "\n  It seems ${0##*/} was called directly."
     echo -e "  Please create a sequence script first.\n"
-    read -p "  Create a template now? y/n(default)? " answer
+    read -p "  Create a template now? y/[n]? " answer
     case $answer in
       [yY])
         createTemplate
@@ -475,18 +486,18 @@ main() {
 
   # compatibility check of sequence
   if [ ! -z $VERSION_SEQREV ] && [ $VERSION_SEQREV -gt $VERSION_REV ] ; then
-    echo "[ERROR] Unsupported sequence revision"
+    echo " [E] Unsupported sequence revision"
     showVersion
     exit 1
   fi
   # exclude older versions if needed
   if [ ! -z $VERSION_SEQREV ] && [ $VERSION_SEQREV -lt 3 ] ; then
-    echo "[ERROR] Unsupported sequence revision (addConf)"
+    echo " [E] Unsupported sequence revision (addConf)"
     showVersion
     exit 1
   fi
   if [ -z $VERSION_SEQREV ] ; then
-    echo -e "[WARNING] No sequence revision found. Trying anyway...\n";
+    echo -e " [W] No sequence revision found. Trying anyway...\n";
   fi
 
   # check for starting step  
@@ -499,9 +510,9 @@ main() {
 
   if [ $DRY -ne 0 ] ; then
     echo
-    echo "[WARN] Dry run active."
-    echo "       Printed commands may not be accurate (e.g. quotation incorrect)"
-    echo "       Sequence may ignore dry run"
+    echo " [W] Dry run active."
+    echo "     Printed commands may not be accurate (e.g. quotation incorrect)"
+    echo "     Sequence may ignore dry run"
     read -p "Press enter to continue or Ctrl + c to abort"
   fi