Added usage, usage_and_exit, version and error

general_utils

@@ -28,3 +28,22 @@ exec_process_substitution () {
     printf '%s' "$__result"
     return $__result_code
 }
+
+usage () {
+    echo "Usage: $PROGRAM [--file config] [--?] [--help] [--version] [--dbg]" 
+    # UpdateController.conf"
+}
+
+usage_and_exit () {
+    usage
+    exit $1
+}
+
+version () {
+    echo "$PROGRAM version $VERSION"
+}
+
+error () {
+    echo "$@" 1>&2
+    usage_and_exit 1
+}