Listing Groups - Gnus Manual
L
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List all groups, whether they have unread articles or not (gnus-group-list-all-groups). If the numeric prefix is used, this command will list only groups of level ARG and lower. By default, it lists groups of level seven or lower (i.e., just subscribed and unsubscribed groups).
Sat Aug 18 23:56:44 2018 - permalink -
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https://www.gnu.org/software/emacs/manual/html_node/gnus/Listing-Groups.html