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 @Zhenkai_W:

Unlock 7 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1427 active golfers, 5800 entries

Solutions by @Zhenkai_W:
10
#378 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:56AM

11
#>657 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:55AM

12
#>729 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:53AM

13
#>767 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:52AM

14
#>824 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:51AM

16
#>991 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:44AM

17
#>1051 - Zhenkai W. / @Zhenkai_W

12/24/2020 at 03:39AM