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 @MeestaWong:

Unlock 14 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1514 active golfers, 6202 entries

Solutions by @MeestaWong:
10
#52 - MeestaWong / @MeestaWong

03/15/2020 at 10:54PM

10
#>52 - MeestaWong / @MeestaWong

03/15/2020 at 10:55PM

11
#>478 - MeestaWong / @MeestaWong

03/15/2020 at 10:52PM

12
#>754 - MeestaWong / @MeestaWong

03/15/2020 at 10:48PM

14
#>834 - MeestaWong / @MeestaWong

03/15/2020 at 10:47PM

17
#>1080 - MeestaWong / @MeestaWong

03/15/2020 at 10:49PM

18
#>1134 - MeestaWong / @MeestaWong

03/15/2020 at 10:34PM

19
#>1178 - MeestaWong / @MeestaWong

03/15/2020 at 10:33PM

20
#>1224 - MeestaWong / @MeestaWong

03/15/2020 at 10:32PM

20
#>1224 - MeestaWong / @MeestaWong

03/15/2020 at 10:46PM

21
#>1293 - MeestaWong / @MeestaWong

03/15/2020 at 10:29PM

22
#>1337 - MeestaWong / @MeestaWong

03/15/2020 at 10:31PM

27
#>1446 - MeestaWong / @MeestaWong

03/15/2020 at 10:28PM

29
#>1463 - MeestaWong / @MeestaWong

03/15/2020 at 10:27PM