How to write from beginning of text file?

Hello all,
All we have to do is to modify just first 2 lines of a 200,000 line files. I can do UTL_FILE.FCOPY to copy from line 3 to end of file and create a new file (FILE1). Now open a new file (say FILE2) and write the modified version of first two lines and then read the file (FILE1) which has rest of the original contents to write to this FILE2. But this process is taking for ever (around 30 minutes).
It would have been easy if I can open FILE1 and just write the first 2 lines. But when I open in append mode I can only write only at the bottom of the file. I tried UTL_FILE.FSEEK but it is not working when the file is opened in Append mode.
Anyone with a solution / suggestion / workaround is greatly appreciated.
Thanks in advance,
Manohar

Francois,
I know the command in Unix to concatenate. There are other easy ways if I can make HOST command work on the application server instead of my local machine. To my surprise both HOST and TEXT_IO are able to work only on my local machine.
I was under the same impression as you are and trying to execute HOST providing Unix commands. Nothing working ... finally when I tried
HOST('echo abc > c:\sample.txt');
it crreated sample.txt on my local machine c:\
Let me know if I am missing something.
Thanks
Manohar

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