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 @AngeeelD:

Created by: @johnreitano Tweet

1517 active golfers, 6208 entries

Solutions by @AngeeelD:

10

#226 - Ángel Durán / @AngeeelD

07/07/2020 at 08:29PM

10

#>226 - Ángel Durán / @AngeeelD

07/07/2020 at 08:31PM

11

#>587 - Ángel Durán / @AngeeelD

07/07/2020 at 08:25PM

12

#>774 - Ángel Durán / @AngeeelD

07/07/2020 at 08:16PM

13

#>818 - Ángel Durán / @AngeeelD

07/07/2020 at 04:16PM

13

#>818 - Ángel Durán / @AngeeelD

07/07/2020 at 04:16PM

14

#>857 - Ángel Durán / @AngeeelD

07/07/2020 at 04:13PM

15

#>942 - Ángel Durán / @AngeeelD

07/07/2020 at 05:26AM

16

#>1025 - Ángel Durán / @AngeeelD

07/07/2020 at 05:09AM

20

#>1259 - Ángel Durán / @AngeeelD

07/07/2020 at 05:08AM

21

#>1314 - Ángel Durán / @AngeeelD

07/07/2020 at 05:04AM