Flag for disabling concurrent checks & copy

[calisro (Rob)]

I added it.

Pipe lists via standard in using dash

Also would have helped here:

Pass `find` results to `rclone delete` command

calisro's solutions are what I typically use when doing these kinds of deletes. But if you are more comfortable/happier with find then you can try piping the results into rclone deletefile. Just be sure you have the syntax correct for the path. Easy to check with --dry-run. https://rclone.org/commands/rclone_deletefile/