@@ -62,6 +62,9 @@ function trueorfalse {

     $xtrace

 }

+function isset {

+    [[ -v "$1" ]]

+}

 # Control Functions

 # =================

@@ -205,16 +205,6 @@ function iniuncomment {

     $xtrace

 }

-function isset {

-    nounset=$(set +o | grep nounset)

-    set +o nounset

-    [[ -n "${!1+x}" ]]

-    result=$?

-    $nounset

-    return $result

-}

-

-

 # Restore xtrace

 $INC_CONF_TRACE

@@ -196,3 +196,20 @@ if is_ubuntu; then

         echo "is_package_installed() on deleted package failed"

     fi

 fi

+

+# test isset function

+echo  "Testing isset()"

+you_should_not_have_this_variable=42

+

+if isset "you_should_not_have_this_variable"; then

+    echo "OK"

+else

+    echo "\"you_should_not_have_this_variable\" not declared. failed"

+fi

+

+unset you_should_not_have_this_variable

+if isset "you_should_not_have_this_variable"; then

+    echo "\"you_should_not_have_this_variable\" looks like declared variable. failed"

+else

+    echo "OK"

+fi