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 @AkeyCoy:

Unlock 8 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1517 active golfers, 6208 entries

Solutions by @AkeyCoy:
10
#285 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:35AM

11
#>627 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:32AM

12
#>780 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:31AM

14
#>870 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:30AM

15
#>955 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:26AM

16
#>1046 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:21AM

22
#>1365 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:21AM

68
#>1512 - 刘宏亮 / @AkeyCoy

09/07/2020 at 06:20AM