I have been using the flip-flop operator in Perl for ages, equating it with sed and awk line addressing. However a question just came up that asked how we process from a specific line until end-of-file. In sed and awk the last line of the file is denoted by $, but that does not work in Perl for obvious syntax reasons.
I had to think about that: the solution is to use eof(). So, to list a file from line 20 we can use:
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