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bathory and geeman2.0: nice try - would be fine if there was one line per entry, but there are multiple lines per entry... each multiple-line entry sep'd by a blank line. Now you see why tail wouldn't do it.
Looking back on it, I see that the tip I could have given is the necessity of counting.
Unless you manage some sort of 10-blocks long FIFO, you have to decide when you start counting (and displaying), and when you stop. This can only be done from the tail end, hence the tac.
Next, the counter had to be placed in a variable, because a simple line count did not apply here. And variables are unknown to common text processing tools, except to awk, hence the awk.
Now the output only had to be put in the proper order again, hence the final tac.