If you write all the programs that write to the files, you can use locks, but take care, file locks is not a real restriction, you can ignore it if you want

Not necessarily. Some OSes (Windows, for example) have mandatory locks (as opposed to advisory locks).

In reply to Re^2: Best practices for modifying a file in place: q's about opening files, file locking, and using the rename function by ikegami
in thread Best practices for modifying a file in place: q's about opening files, file locking, and using the rename function by davebaker

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