> Do you have the option to "seek" to the correct place in the file to make
> your changes? For example, perhaps:
>
> - Your changes are few compared to writing out the whole file
> - Your changes do not change the size of the file (or you can pad line-end
> with spaces)
>
1. each time just changes few lines, not the full file.
2. it has file size changed, but yes I can pad line-end with space.
So what's the further?
Thanks
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