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 @noamteyssier:

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

1537 active golfers, 6308 entries

Solutions by @noamteyssier:
10
#323 - noam teyssier / @noamteyssier

10/15/2020 at 01:40AM

11
#>668 - noam teyssier / @noamteyssier

10/15/2020 at 01:39AM

12
#>795 - noam teyssier / @noamteyssier

10/15/2020 at 01:39AM

13
#>838 - noam teyssier / @noamteyssier

10/15/2020 at 01:37AM

14
#>887 - noam teyssier / @noamteyssier

10/15/2020 at 01:33AM

14
#>887 - noam teyssier / @noamteyssier

10/15/2020 at 01:36AM

15
#>976 - noam teyssier / @noamteyssier

10/15/2020 at 01:32AM

25
#>1459 - noam teyssier / @noamteyssier

10/15/2020 at 01:29AM