Hi there ... The manpage says, when grouping is disabled, "Output is printed as soon as possible" and "the outputs from different commands are mixed together".
As far as I understand, that means not only lines might appear in quite a funny oder, it might also be, that one line of out- put is a mixture of several lines of different jobs. And than there is this example: | | GNU Parallel as dir processor | | [...] | The -u is needed because of a small bug in GNU parallel. If | that proves to be a problem, file a bug report. | In case the mentioned bug has been fixed in the meantime, the example should be updated and the -u should be removed. (As well as the description about an existing bug.) In case the mentioned bug has not already been fixed, I'd vote for removing the whole example, as it's just working. Thomas
