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Until the other day, I never realized that the `find` command's `-exec` argument uses the command's success/failure as a boolean result for subsequent arguments…which means you can chain things off of exec results directly in find.

This is incredibly useful!

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Find all files where a command succeeds:

find . -type f -exec filecheck {} \; -print

Find all files where a command fails:

find . -type f \! -exec filecheck {} \; -print

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