Hi ksh maintainers, I have noticed a change in handling of the pipefail option in ksh. The change occurred somewhere between ksh-93t+ and ksh-93u+.
When the pipefail option is set, command pipelines return an error (non-zero) status if any process in a pipeline returns an error status. In ksh-93t+, an error status from any pipeline stage triggers an ERR trap or errexit. In ksh-93u+, a pipeline returns the expected error status if any command returns an error, but execution continues as though the error did not occur (unless the error comes from the last pipeline stage). For example: #!/bin/ksh set -o pipefail set -e errexit trap 'echo ERR' ERR false | true echo "Continued past error $?" Without the pipefail option, "false | true" would return 0, but with the pipefail option, it returns 1. In ksh-93t+, the above commands display "ERR" and exit the shell. But in ksh-93u+, the message "Continued after error 1" is displayed without exiting the shell, indicating that the error status from the pipeline is not triggering either the ERR trap or errexit option. Is this change in behaviour a deliberate feature, or does it indicate a bug? Regards, Milton. _______________________________________________ ast-users mailing list ast-users@lists.research.att.com http://lists.research.att.com/mailman/listinfo/ast-users
