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 @nnmnsmmr:

Unlock 11 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1427 active golfers, 5800 entries

Solutions by @nnmnsmmr:
10
#206 - Dan / @nnmnsmmr

06/27/2020 at 04:23PM

10
#>206 - Dan / @nnmnsmmr

06/27/2020 at 04:24PM

11
#>541 - Dan / @nnmnsmmr

06/27/2020 at 04:14PM

12
#>711 - Dan / @nnmnsmmr

06/27/2020 at 04:13PM

13
#>755 - Dan / @nnmnsmmr

06/27/2020 at 04:08PM

15
#>875 - Dan / @nnmnsmmr

06/27/2020 at 01:52PM

16
#>950 - Dan / @nnmnsmmr

06/27/2020 at 01:50PM

17
#>1031 - Dan / @nnmnsmmr

06/27/2020 at 01:56PM

20
#>1179 - Dan / @nnmnsmmr

06/27/2020 at 01:46PM

22
#>1275 - Dan / @nnmnsmmr

06/27/2020 at 01:45PM

26
#>1358 - Dan / @nnmnsmmr

06/27/2020 at 01:38PM