BEDOPS works with standard input and output streams, so you can pipe results to standard Unix tools. You can pipe the result to cut with 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