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 @Xvluk:

Created by: @johnreitano Tweet

1517 active golfers, 6208 entries

Solutions by @Xvluk:

10

#172 - Ксения / @Xvluk

06/01/2020 at 08:48AM

11

#>546 - Ксения / @Xvluk

06/01/2020 at 08:19AM

12

#>769 - Ксения / @Xvluk

06/01/2020 at 08:15AM

14

#>853 - Ксения / @Xvluk

06/01/2020 at 08:04AM

15

#>935 - Ксения / @Xvluk

06/01/2020 at 08:02AM

16

#>1013 - Ксения / @Xvluk

05/31/2020 at 09:02PM

19

#>1194 - Ксения / @Xvluk

05/31/2020 at 08:24PM

20

#>1248 - Ксения / @Xvluk

05/31/2020 at 08:19PM

21

#>1311 - Ксения / @Xvluk

05/31/2020 at 08:13PM

23

#>1397 - Ксения / @Xvluk

05/31/2020 at 08:04PM

30

#>1476 - Ксения / @Xvluk

05/31/2020 at 09:01PM

34

#>1486 - Ксения / @Xvluk

05/31/2020 at 08:00PM

35

#>1490 - Ксения / @Xvluk

05/31/2020 at 07:53PM

35

#>1490 - Ксения / @Xvluk

05/31/2020 at 08:40PM

94

#>1513 - Ксения / @Xvluk

05/31/2020 at 07:52PM