Do I need flock for files that never change?

I'm using a script that inserts the files header.txt and footer,txt
to every page. Do i need to add flock().
I mean do data of unchanged files like footer.txt and header.txt get erased if opend at the same time?
Is it true that data in a file get erased only if the they are subject to a change by the script?


[This message has been edited by TLU (edited August 19, 2000).]

no, just if you are writeing to the file.

I got it.
Thank u very much