LI NGOK LAM said:
>>
>> You want seek(), and possibly tell().
>>
>> perldoc -f seek
>>
>
> Thanks for reply, but seems I have to clarify my question.
> 'seek' and 'tell' only helping me to target my position within
> a file handle.
>
> Say, if I have a 1MB file, and I just want to over write
> bytes from 0 to 1000 byte then my job is done, file is supposed
> to be saved. I  want to avoid to rewrite the rest 900KBs again.
>
> Would you imagine what I am asking ?
>
> Welcome for any further suggestions.

Open your file in read/write mode.
Seek to where you want to be.
Write the data.
Close the file.

You will probably want to open the file with a mode of "+<".

perldoc -f open

-- 
Paul Johnson - [EMAIL PROTECTED]
http://www.pjcj.net


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