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A comment on Pipes and Filters.
http://www.gnu.org/software/bash/manual/html_node/Pipelines....
"If pipefail is enabled, the pipeline’s return status is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands exit successfully"
http://www.gnu.org/software/bash/manual/html_node/Pipelines....
"If pipefail is enabled, the pipeline’s return status is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands exit successfully"