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There are several ways to check if a file exists.

The options I know:

  • Access ()
  • Do anybody know which of these best performances?

    Edit: Estimate walking / dev / shm where access time is not a factor.

    Here the runtime switch will dominate the operation of kernel mode and file system drivers - even Exclude disc time. It is highly unlikely that none of these will offer the best performance Best Interface - Promotion :: Filesystem .

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