With set -o pipefail, what exit status does a pipeline return?

Question

Accepted Answer

The status of the rightmost command that failed, or zero if all of them succeeded — pipefail makes the pipeline's status that of the LAST (rightmost) command to exit non-zero, so an early failure isn't masked. Option two (leftmost) is wrong — it's the rightmost failing one. Option three (final command's status) is the DEFAULT that pipefail changes. Option four inverts the logic — pipefail reports failure if ANY stage fails.

Answer

The status of the leftmost command that failed anywhere along the pipeline

Answer

The status of the final command only, ignoring any earlier command failures

Answer

Zero as long as at least one command in the pipeline exited successfully

With set -o pipefail, what exit status does a pipeline return?

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