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 @giursino1:

Created by: @johnreitano Tweet

1519 active golfers, 6223 entries

Solutions by @giursino1:

10

#49 - giursino / @giursino1

03/15/2020 at 12:25PM

10

#>144 - giursino / @giursino1

05/18/2020 at 05:12PM

11

#>480 - giursino / @giursino1

03/15/2020 at 12:24PM

12

#>758 - giursino / @giursino1

03/15/2020 at 12:22PM

13

#>801 - giursino / @giursino1

03/15/2020 at 12:20PM

14

#>838 - giursino / @giursino1

03/15/2020 at 12:19PM

16

#>998 - giursino / @giursino1

03/15/2020 at 12:18PM

19

#>1182 - giursino / @giursino1

03/15/2020 at 12:09PM

20

#>1246 - giursino / @giursino1

05/18/2020 at 05:10PM

21

#>1298 - giursino / @giursino1

03/15/2020 at 12:08PM

22

#>1342 - giursino / @giursino1

03/15/2020 at 12:04PM

23

#>1388 - giursino / @giursino1

03/15/2020 at 12:07PM

24

#>1415 - giursino / @giursino1

03/15/2020 at 11:28AM

27

#>1451 - giursino / @giursino1

03/15/2020 at 11:35AM