WordPress tip: Get rid of unused shortcodes
Simply run the following SQL query on your WordPress database, using the command line client or PhpMyAdmin. In this example, I assume the unused shortcode is [tweet].
Don’t forget to backup your database before using this query.
UPDATE wp_post SET post_content = replace(post_content, '[tweet]', '' ) ;
If you like to know more about WordPress SQL queries, you should have a look to this article.
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WordPress tip: Get rid of unused shortcodes