Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 5e4dfcccaa2db400090b66c3

prepend * to every non-blank line

Prepend an asterisk to every non-blank line in the input file.

Start file
This is a
very short

file, but it is 
still
full

of

surpises.
End file
*This is a
*very short

*file, but it is 
*still
*full

*of

*surpises.

View Diff

1,2c1,2
< This is a
< very short
---
> *This is a
> *very short
4,6c4,6
< file, but it is 
< still
< full
---
> *file, but it is 
> *still
> *full
8c8
< of
---
> *of
10c10
< surpises.
---
> *surpises.

Solutions by @pykJzzzsmAzloZl:

Unlock 9 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1459 active golfers, 5946 entries

Solutions by @pykJzzzsmAzloZl:
10
#375 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:42AM

11
#>667 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:40AM

12
#>750 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:40AM

13
#>788 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:39AM

14
#>845 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:39AM

17
#>1078 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:38AM

18
#>1117 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:36AM

19
#>1167 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:35AM

21
#>1273 - 김도현 / @pykJzzzsmAzloZl

12/21/2020 at 10:29AM