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 @Maxim_at_Moscow:

Unlock 13 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1514 active golfers, 6201 entries

Solutions by @Maxim_at_Moscow:
10
#75 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:11PM

11
#>491 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:09PM

12
#>757 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:07PM

12
#>757 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:08PM

14
#>836 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:06PM

15
#>909 - Maxim / @Maxim_at_Moscow

03/26/2020 at 05:04PM

16
#>996 - Maxim / @Maxim_at_Moscow

03/25/2020 at 06:13PM

17
#>1082 - Maxim / @Maxim_at_Moscow

03/25/2020 at 06:11PM

21
#>1294 - Maxim / @Maxim_at_Moscow

03/25/2020 at 06:07PM

22
#>1339 - Maxim / @Maxim_at_Moscow

03/25/2020 at 05:57PM

26
#>1441 - Maxim / @Maxim_at_Moscow

03/25/2020 at 05:56PM

29
#>1463 - Maxim / @Maxim_at_Moscow

03/25/2020 at 06:02PM

40
#>1497 - Maxim / @Maxim_at_Moscow

03/25/2020 at 06:01PM