diff --git a/bin/bash-back b/bin/bash-back
index f723e21..2fea571 100755
--- a/bin/bash-back
+++ b/bin/bash-back
@@ -10,19 +10,33 @@ SCRIPT=$1
 function exit {
   code=${1:-0}
 
+  stack_lines=("${BASH_LINENO[@]}")
+  stack_functions=("${FUNCNAME[@]}")
+  stack_sources=("${BASH_SOURCE[@]}")
+  unset stack_lines[-1]
+  unset stack_lines[-1]
+  unset stack_functions[0]
+  unset stack_functions[-1]
+  stack_functions[-1]='<main>'
+  unset stack_sources[0]
+  unset stack_sources[-1]
+  stack_lines=("${stack_lines[@]}")
+  stack_functions=("${stack_functions[@]}")
+  stack_sources=("${stack_sources[@]}")
+
   if [[ -s $TMP_ERROR ]]; then
-    content=$(<$TMP_ERROR)
+    last_error=$(tail -n1 $TMP_ERROR)
     $DEBUG && >/dev/tty echo '---stderr---'
-    >&4 echo "DETECTED: [$content]"
+    >&4 echo "ERROR $code: [$last_error]"
   fi
 
-  stack_lines=("${BASH_LINENO[@]}")
-  stack_functions=("${FUNCNAME[@]}")
-  stack_sources=("${BASH_SOURCE[@]}")
+  for i in "${!stack_functions[@]}"; do
+    printf "%30s\t%s\n" "${stack_sources[$i]}:${stack_lines[$i]}" "${stack_functions[$i]}"
+  done
 
-  echo "${stack_lines[@]}"
-  echo "${stack_functions[@]}"
-  echo "${stack_sources[@]}"
+  # echo "${stack_lines[@]}"
+  # echo "${stack_functions[@]}"
+  # echo "${stack_sources[@]}"
 
   cleanup ${code}
 }
diff --git a/lib/utility.bash b/lib/utility.bash
new file mode 100644
index 0000000..9be6d77
--- /dev/null
+++ b/lib/utility.bash
@@ -0,0 +1,10 @@
+function blabla {
+  echo IN blabla OUT
+  suite
+}
+
+function suite {
+  return 7
+  echo $nope
+  command_not_found
+}
diff --git a/useless.sh b/useless.sh
index 3b62170..6c96c3d 100755
--- a/useless.sh
+++ b/useless.sh
@@ -3,10 +3,11 @@
 function F2 {
   echo "stdout A"
   # echo toto >>/tmp/toto
-  # $nope
-  grep titi toto
-  # exit 6
   >&2 echo "This is stderr"
+  blabla
+  exit 6
+  grep titi toto
+  $nope
   echo "stdout B"
   echo "stdout C"
   # command_not_found
@@ -17,6 +18,11 @@ function F1 {
   F2
 }
 
+function main {
+  F1
+}
+
+. lib/utility.bash
 echo start of useless
-F1
+main
 echo end of useless