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3.27.4 Really Various Summary Commands

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C-d
If the current article is a collection of other articles (for instance, a digest), you might use this command to enter a group based on the that article (gnus-summary-enter-digest-group). Gnus will try to guess what article type is currently displayed unless you give a prefix to this command, which forces a “digest” interpretation. Basically, whenever you see a message that is a collection of other messages of some format, you C-d and read these messages in a more convenient fashion.

The variable gnus-auto-select-on-ephemeral-exit controls what article should be selected after exiting a digest group. Valid values include:

next
Select the next article.
next-unread
Select the next unread article.
next-noselect
Move the cursor to the next article. This is the default.
next-unread-noselect
Move the cursor to the next unread article.

If it has any other value or there is no next (unread) article, the article selected before entering to the digest group will appear.

C-M-d
This command is very similar to the one above, but lets you gather several documents into one biiig group (gnus-summary-read-document). It does this by opening several nndoc groups for each document, and then opening an nnvirtual group on top of these nndoc groups. This command understands the process/prefix convention (see Process/Prefix).
C-t
Toggle truncation of summary lines (gnus-summary-toggle-truncation). This will probably confuse the line centering function in the summary buffer, so it's not a good idea to have truncation switched off while reading articles.
=
Expand the summary buffer window (gnus-summary-expand-window). If given a prefix, force an article window configuration.
C-M-e
Edit the group parameters (see Group Parameters) of the current group (gnus-summary-edit-parameters).
C-M-a
Customize the group parameters (see Group Parameters) of the current group (gnus-summary-customize-parameters).