How to truncate a file after partly overwriting it

[Philip Nienhuis]

Hi,

I'd like to partly overwrite a text file starting from position X. However,
the new part to be written is shorter than the rest of the original file
contents from X to EOF. Consequently, after the newly written part, the
remainder of the old contents show up.
So, how can I close & truncate the file after the end of the new part?

Thanks,

Philip



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