I don't quite see the point of having gnu parallel discussed in the bash reference manual. http://www.gnu.org/software/bash/manual/bashref.html#GNU-Parallel
I don't argue that it can be a useful tool, but then you might as well discuss sed awk grep make find etc.. Or even the ones not part of the standard toolset since parallel is not installed by default even on the linux distribution I know: flock fdupes recode convmv rsync etc... On top of that the examples teach incorrect things eg, "the common idioms that operate on lines read from a file"(sic) for x in $(cat list); do doesn't even read lines! I'd say this should be removed.
