When executing a source block in org mode with the output set to verbatim, it will sometimes wrap the results in an #begin_example block, and sometimes it uses : symbols at the beginning of the line. How can I force it to do one or the other?
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This behaviour is controlled by the variable org-babel-min-lines-for-block-output:
The minimum number of lines for block output. If number of lines of output is equal to or exceeds this value, the output is placed in a #+begin_example...#+end_example block. Otherwise the output is marked as literal by inserting colons at the starts of the lines. This variable only takes effect if the :results output option is in effect.
The default value for this variable is 10. So if you want to force babel to use :, you need to set this to a suitably large number, e.g.,
(setq org-babel-min-lines-for-block-output 1000)
Conversely, you can set it to 0 to force babel to always use the begin_example format.