append data / locks

Hello,

I have several scripts that are using the redirection operator >> to
append data to a masterfile.

I now want to ensure that the masterfile is only opened by one script
at a time.
I assume I can solve this somehow by locks - but then I would need to
check if the file is not already open and set a lock at the same time.
Is there a way to do this?
or any other ideas?

Thanks,
Sven

.

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