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 @Xp_Bar:

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

1517 active golfers, 6208 entries

Solutions by @Xp_Bar:
10
#108 - nick / @Xp_Bar

04/30/2020 at 09:40PM

10
#>166 - nick / @Xp_Bar

05/29/2020 at 03:19PM

11
#>516 - nick / @Xp_Bar

04/30/2020 at 09:39PM

12
#>760 - nick / @Xp_Bar

04/30/2020 at 09:38PM

14
#>844 - nick / @Xp_Bar

04/30/2020 at 09:37PM

15
#>923 - nick / @Xp_Bar

04/30/2020 at 09:29PM

15
#>932 - nick / @Xp_Bar

05/29/2020 at 03:18PM

16
#>1005 - nick / @Xp_Bar

04/30/2020 at 09:27PM

16
#>1005 - nick / @Xp_Bar

04/30/2020 at 09:43PM

18
#>1142 - nick / @Xp_Bar

04/30/2020 at 09:25PM

19
#>1187 - nick / @Xp_Bar

04/30/2020 at 09:23PM

21
#>1307 - nick / @Xp_Bar

04/30/2020 at 09:18PM

21
#>1307 - nick / @Xp_Bar

04/30/2020 at 09:22PM

60
#>1511 - nick / @Xp_Bar

04/30/2020 at 09:31PM