screen: Caption
9.6 Caption
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-- Command: caption always|splitonly [string]
-- Command: caption string [string]
(none)
This command controls the display of the window captions. Normally
a caption is only used if more than one window is shown on the
display (split screen mode). But if the type is set to 'always',
'screen' shows a caption even if only one window is displayed. The
default is 'splitonly'.
The second form changes the text used for the caption. You can use
all string escapes (⇒String Escapes). 'Screen' uses a
default of '%3n %t'.
You can mix both forms by providing the string as an additional
argument.