To: wazat, a start reading about sysread() and syswrite() and it looks like a good solution only in cases the program does not include seek() tell() etc. Unfortunately in my case these functions are necessary. It is nice to know that there are alternative solutions for future use. Thank you for your time and effort.

I am new user to this cite and I have not figure out how to vote answers, it is not so clear to me. Can you point me to right direction to read the documentation thanks again. Best Regards.

In reply to Re^2: Writing at specific position and length in binary file. by thanos1983
in thread Writing at specific position and length in binary file. by thanos1983

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