improved code quality, few bug fixes

lib/aaa_errors.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 # ------------------------------------------------------------------------------
 # Error management functions
 # This file is part of the init.sh project
@@ -7,7 +8,7 @@
 # The complete license agreement can be obtained at:
 # https://opensource.org/licenses/BSD-3-Clause
 # ------------------------------------------------------------------------------
- 
+
 
 # ------------------------------------------------------------------------------
 # Exit with error
@@ -29,7 +30,7 @@ function die()
     unset errorcode
 
     # Put the trigger back (only executed with --keepgoing)
-    trap "error ${LINENO}" ERR
+    trap 'error ${LINENO}' ERR
 }
 export -f die
 
@@ -73,8 +74,8 @@ trap "error ${LINENO}; backtrace; err_exit" ERR
 function err_exit
 {
     if [[ $KEEPGOING != true ]]; then
-        if [[ -f $tmpfile ]]; then
-            rm -f $tmpfile
+        if [[ -f "$tmpfile" ]]; then
+            rm -f "$tmpfile"
         fi
         exit 255
     fi
@@ -94,7 +95,7 @@ function backtrace
             printf '%15s() %s:%d\n' \
                 "$func" "${BASH_SOURCE[$i]}" "${BASH_LINENO[ (( $i - 1)) ]}"
         fi
-        let i++ || true
+        (( i++ )) || true
     done
     unset func i
     echo "=============================="
@@ -120,7 +121,7 @@ noerror()
     fi
     echo $?
 
-    trap "error ${LINENO}" ERR
+    trap 'error ${LINENO}' ERR
     set -o errexit
 }
 export -f noerror