Preprocessing CCK field output

So I spent a totally unproductive morning figuring out how to override a single field's output in Drupal without rewriting my complete template code for the content type - I want to keep using the $content variable. After many a fruitless attempt luckily Grag Harvey has the answer:

Actually, control over CCK fields can be gained using CCK's own templates.

Consider the situation where your field is called field_test.

Copy content-field.tpl.php to your theme directory and copy it again for the field whose mark-up you wish to alter, naming it content-field-field_test.tpl.php in this case.

Then change the mark-up in the file and it will alter the output of that specific CCK field.

No need to touch node.tpl.php!

Adapted via greg.harvey's answer at node.tpl.php | Drupal API.

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