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lang-bash
pipefailand check$??pvseems to write to a file via a redirection, meaningsha256sumwon't ever get anything to process. Likewise, the output ofsha256sumis redirected to a file, so even if it produced output,cutwould never get anything to work with. Consequently, the finalreadwon't do anything as all the data is written to files instead of to the next stage of the pipeline. If the redirections are removed, thereadmight read something into theSHASUMvariable, but this is not what our question is about.pvdoesn't fail there, so of course there's no failure to detect and so it's a completely different problem than the original question).