dump all articles for given group

I want to e.g. grep all the articles in group gmane.linux.hams for a
certain string, however most of the articles in that group on my
offline machine are just headers and no bodies. I don't want to
trigger any requests for bodies.  I just want to dump all the articles
for that group to stdout. noffle -a doesn't have a way to limit
actions to just one group.



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