$ help set
    
    ...
          -e  Exit immediately if a command exits with a non-zero status.
          -E  If set, the ERR trap is inherited by shell functions.
          -u  Treat unset variables as an error when substituting.
          -o option-name
              Set the variable corresponding to option-name:
                           pipefail     the return value of a pipeline is the status of
                           the last command to exit with a non-zero status,
                           or zero if no command exited with a non-zero status