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 @I_aM_Bhargav:

Unlock 10 remaining solutions by signing in and submitting your own entry
Created by: @johnreitano

1517 active golfers, 6208 entries

Solutions by @I_aM_Bhargav:
10
#139 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:36AM

11
#>537 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:31AM

12
#>766 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:31AM

13
#>811 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:29AM

14
#>848 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:29AM

16
#>1010 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:27AM

18
#>1145 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:25AM

22
#>1355 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:15AM

42
#>1502 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:07AM

166
#>1515 - Bhargav Makwana / @I_aM_Bhargav

05/15/2020 at 07:06AM