BEDOPS works with standard input and output streams, so you can pipe results to standard Unix tools. You can pipe the result to
awk to count, or pipe to
wc -l to count lines. If you're using
bedmap, you can use
--countto count mapped elements.
Try intervene module to visualize it (https://intervene.readthedocs.io/en/latest/modules.html):
intervene venn -i path/to/BED/files/*.bed --output ~/results/path