10-26-2013
Note that the last paragraph of the description section of the current POSIX Standard's wc utility man page is:
Quote:
Tails relative to the end of the file may be saved in an internal buffer, and thus may be limited in length. Such a buffer, if any, shall be no smaller than {LINE_MAX}*10 bytes.
so,
tail -n 50000 is likely to fail (i.e., give some number between 10 and 50,000 lines from the end of the file with a good chance that the first line would be missing one or more bytes from the start of that line) without warning on some systems. I'm almost positive that is the way it worked on UNIX System V Release 4's tail utility and I have no idea how many versions of tail that were originally derived from that source have been modified to handle unlimited numbers of bytes or lines when grabbing data from the end of a file.
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