Adding existing attribute to all attribute sets

Question

I have an existing attribute for an embed code. I need to associate this attribute with 120+ existing attribute sets.

If I know the attribute set id, ho

Answer 1

for people having problems with the code above,

like: Call to a member function getModelInstance() on a non-object

you need to add the following to to top of your file:

include 'app/Mage.php';
Mage::app();

edit:

im using magento 1.8.1.0 and the code still didn't work

i had to add the following line to $newItem, this way the validation passes

    ->setAttributeCode($attCode)