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 @imdavidhwang:

Created by: @johnreitano Tweet

1517 active golfers, 6208 entries

Solutions by @imdavidhwang:

10

#96 - David / @imdavidhwang

04/16/2020 at 10:34PM

10

#>96 - David / @imdavidhwang

04/16/2020 at 10:36PM

10

#>100 - David / @imdavidhwang

04/19/2020 at 11:40PM

10

#>100 - David / @imdavidhwang

04/19/2020 at 11:40PM

10

#>225 - David / @imdavidhwang

07/06/2020 at 10:51PM

11

#>506 - David / @imdavidhwang

04/16/2020 at 10:34PM

12

#>760 - David / @imdavidhwang

04/16/2020 at 10:33PM

14

#>841 - David / @imdavidhwang

04/16/2020 at 10:31PM

15

#>917 - David / @imdavidhwang

04/16/2020 at 10:30PM

16

#>1002 - David / @imdavidhwang

04/16/2020 at 10:23PM

16

#>1002 - David / @imdavidhwang

04/16/2020 at 10:27PM

16

#>1002 - David / @imdavidhwang

04/16/2020 at 10:31PM

16

#>1004 - David / @imdavidhwang

04/19/2020 at 11:40PM

17

#>1088 - David / @imdavidhwang

04/16/2020 at 10:27PM

17

#>1088 - David / @imdavidhwang

04/16/2020 at 10:29PM

19

#>1186 - David / @imdavidhwang

04/16/2020 at 10:18PM

20

#>1234 - David / @imdavidhwang

04/16/2020 at 09:39PM

21

#>1302 - David / @imdavidhwang

04/16/2020 at 10:26PM

24

#>1415 - David / @imdavidhwang

04/16/2020 at 09:22PM