14.8.2.23 :eval

The :eval header argument can be used to limit the evaluation of specific code blocks. The :eval header argument can be useful for protecting against the evaluation of dangerous code blocks or to ensure that evaluation will require a query regardless of the value of the org-confirm-babel-evaluate variable. The possible values of :eval and their effects are shown below.

never or no

The code block will not be evaluated under any circumstances.

query

Evaluation of the code block will require a query.

never-export or no-export

The code block will not be evaluated during export but may still be called interactively.

query-export

Evaluation of the code block during export will require a query.

If this header argument is not set then evaluation is determined by the value of the org-confirm-babel-evaluate variable see Code evaluation security.