To read "the last line" of any file, seek()
to a position relative to the end
-of-file, that you know is far-enough back to encompass the last few lines, then start reading. (If the file might be UTF-8 then you need to be prepared to ignore UTF-8 errors on the off-chance that your seek put you smack in the middle of a multibyte sequence.) You really want to be sure that you read more-than-one line in this way so as to be very certain that the last line you read is complete.
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