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 @_chuyii:

Created by: @johnreitano Tweet

1517 active golfers, 6208 entries

Solutions by @_chuyii:

10

#59 - ちゅうい / @_chuyii

03/20/2020 at 12:58PM

10

#>59 - ちゅうい / @_chuyii

03/20/2020 at 01:00PM

11

#>483 - ちゅうい / @_chuyii

03/20/2020 at 12:58PM

12

#>758 - ちゅうい / @_chuyii

03/20/2020 at 12:57PM

13

#>799 - ちゅうい / @_chuyii

03/20/2020 at 12:57PM

14

#>836 - ちゅうい / @_chuyii

03/20/2020 at 12:54PM

15

#>911 - ちゅうい / @_chuyii

03/20/2020 at 12:48PM

16

#>996 - ちゅうい / @_chuyii

03/20/2020 at 12:43PM

59

#>1511 - ちゅうい / @_chuyii

03/20/2020 at 12:52PM