[Feature Request] md5 check for mbuffer

[jumbi77]

Hi,
first i'd like to thank you for sharing your script.
I personally used it with mbuffer. mbuffer on sending and receiving side can generate an md5 hash for the streamed data. This would be a nice enhancement to get sure that the transfered data from source to dest is the same (altough zfs also checks there own checksums).

Maybe we can use -H -l /path/to/log.txt on both sides. After finishing the send/recv the script must check/validate the local hash with the remote hash in the log file.
Just an idea, thanks