How to evaluate all code blocks when exporting in emacs org-mode

Question

I have an org-mode document with many different R source code blocks. Whenever I hit C-c C-e and export to PDF or HTML I get a different prompt asking t

Answer 1

Put the following line at the top of your file, that way you get asked one time upon opening it, and the safer non-evaluating default remains true for other files

# -*- org-confirm-babel-evaluate: nil -*-