dd: add optional visual progress bar

[drpt78stu]

Would it be possible to add a visual progress bar to dd?

Currently status=progress only shows a text line like:
1234567890 bytes (1.2 GB, 1.1 GiB) copied, 12 s, 100 MB/s

It would be nice to have something like:
[=========> ] 45% | 1.2 GB / 2.7 GB | 100 MB/s | ETA 00:15

Ideas:

• New status level, e.g. status=bar
• Or an extra flag
• Only show the bar when the total size is known
• Fall back to the current text progress when size is unknown

This would be very nice to have. Thank you for your consideration.

[oech3]

Please request this at https://github.com/coreutils/coreutils too to avoid divergence of interface.

[oech3]

Also note that usecase of it is already covered by pv with options.