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How can I insert or delete a line (or record) in the middle of a file?

April 26, 2017delete file insert line middle record

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How can I insert or delete a line (or record) in the middle of a file?

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Using fcntl(), lock the line or record in the file exclusively. Now, using another thread, read the file, at each byte, trying to write that byte back. Whenever you succeed, write that byte into another file. Then copy the new file over the old file, releasing the lock first.