Convert epub to mobi using calibre, see included note for bulk converting

epub2mobi

#!/bin/bash
FILE=$(basename  "$1" .epub)


if [ -e "${FILE}.mobi" ]; then
  echo nothing to do
else 
  echo converting
  ebook-convert "${FILE}.epub" "${FILE}.mobi"
fi

# NOTE:
# To bulk convert use a function like GNU find as follows
# find /some/director/here -mindepth 1 -type f -iname "*.epub" -execdir epub2mobi "{}" \;