[Tutor] How to delete the last line from a file efficiently?

[Joson]

Hi all,
    Now I have a text file about 1MB.  Sometimes I need to remove the last
line.
    The current method I use is reading all content, finding the last
sentence, remove it and write the new content to the file.
    So, it need to read a 1MB file and write a 1MB file. It's ineffictient,
I think. Are there any other methods?
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