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If you add the -d flag each difference in the command's output will be highlighted.
I also monitor individual drives by adding them to df. Makes for a nice thin status line that I can shove to the bottom of the monitor.
There are 2 alternatives - vote for the best!
While copying a large file that may take up a good chunk of your hard drive, start the copy and run this command concurrently. It will print out the disk information every second. It's pretty handy when you have a large copy with nothing to monitor the progress.
If you can do better, submit your command here.
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