This is a batch script I use for analyzing my recipes. I put recipe and script in one directory (it clean -up first the old run). After the recipe is finish you will find the print screen output in a log file and in folder debug the different conversion stages.
Code:
REM * Remove old debug directory
rmdir debug. /s /q
REM * Delete old recipe and log file
del WirtschaftsWoche.epub
del WirtschaftsWoche.log
REM Run new recipe in debug mode and
ebook-convert WirtschaftsWoche.recipe .epub -vv --debug-pipeline debug > WirtschaftsWoche.log
You can create additional information output via print command within a recipe like printing a variable:
print '*** my_variable_main --->:', my_variable_main
This is helpful for checking the content you like to modify wether it include what you expect or if a selection will be found or not.