Gnus Manual. Node: Summary Buffer Mode Line

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3.1.2: Summary Buffer Mode Line

You can also change the format of the summary mode bar (see Mode Line Formatting). Set gnus-summary-mode-line-format to whatever you like. The default is `Gnus: %%b [%A] %Z'.

Here are the elements you can play with:

`G'

Group name.

`p' Unprefixed group name.
`A' Current article number.
`z' Current article score.
`V' Gnus version.
`U' Number of unread articles in this group.
`e' Number of unread articles in this group that aren't displayed in the summary buffer.
`Z' A string with the number of unread and unselected articles represented either as `<%U(+%e) more>' if there are both unread and unselected articles, and just as `<%U more>' if there are just unread articles and no unselected ones.
`g' Shortish group name. For instance, `rec.arts.anime' will be shortened to `r.a.anime'.
`S' Subject of the current article.
`u' User-defined spec (see User-Defined Specs).
`s' Name of the current score file (see Scoring).
`d' Number of dormant articles (see Unread Articles).
`t' Number of ticked articles (see Unread Articles).
`r' Number of articles that have been marked as read in this session.
`E' Number of articles expunged by the score files.

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