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Does anyone one know of a short key sequence that would do the equivalent of :1,-d:+,$d? Yes, I know you can define a function, macro, and that would be nice. But, maybe a bit more elegant if you could hit some predefined keys, letters, controls, and get the same result.

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    not exactly short... yyggdG"0P on the line you want to preserve.. however that leaves a extra empty line.. you could also do :1,-d | +,$d for single command line execution instead of two – Sundeep Aug 25 '16 at 10:22
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Maybe this will do:

:v/\%#/d

That should deal with corner cases like the line you want to keep being the first line in the buffer, etc.

Or perhaps :move the current line to the beginning of the buffer and delete the rest:

:m0|+,$d

or:

YggPjdG

To repeat later, either map it to a key, or maybe grab it from your history with :v<up> for example.

References:
:help :v
:help /\%#

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    Some more: :.w!|e! and YggVGp – Peter Rincker Aug 25 '16 at 18:21

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