Version: 20170122
The associated man page states:
--group Group output. Output from each jobs is grouped together and is only printed when the command is finished. stderr (standard error) first followed by stdout (standard output).
Actual behavior (note how the stderr line always comes after the stdout line; run from Bash):
$ echo $'#!/bin/bash\necho stderr line >&2\necho stdout line' > ./tst; parallel -P 3 ./tst ::: one two three
stdout line
stderr line
stdout line
stderr line
stdout line
stderr line
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