write errors on the outputs:
  warn           diagnose errors writing to any output
  warn-nopipe    diagnose errors writing to any output not a pipe
  exit           exit on error writing to any output
  exit-nopipe    exit on error writing to any output not a pipe
The default MODE for the -p option is 'warn-nopipe'.
With "nopipe" MODEs, exit immediately if all outputs become broken pipes.
The default operation when --output-error is not specified, is to
exit immediately on error writing to a pipe, and diagnose errors
writing to non pipe outputs.
