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 @fedjagolf:

Unlock 4 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1463 active golfers, 5959 entries

Solutions by @fedjagolf:
18
#1103 - fedja golf / @fedjagolf

06/05/2020 at 12:35PM

22
#>1299 - fedja golf / @fedjagolf

04/12/2020 at 10:54PM

23
#>1339 - fedja golf / @fedjagolf

04/12/2020 at 10:52PM

25
#>1375 - fedja golf / @fedjagolf

04/12/2020 at 10:47PM