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 @0AKl2TLu2sjExmj:

Unlock 16 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1514 active golfers, 6201 entries

Solutions by @0AKl2TLu2sjExmj:
10
#352 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:27PM

10
#>352 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:29PM

11
#>676 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:25PM

12
#>786 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:23PM

12
#>786 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:24PM

13
#>825 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:22PM

14
#>881 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:22PM

15
#>964 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:20PM

16
#>1056 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:17PM

16
#>1056 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:19PM

16
#>1056 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:21PM

17
#>1124 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:21PM

19
#>1209 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:17PM

19
#>1209 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:18PM

20
#>1272 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:16PM

136
#>1511 - 이준희 / @0AKl2TLu2sjExmj

11/14/2020 at 01:14PM