Question

Anyone has an idea how to remove all white space and replace them with a comma , in a file using Vim ?
File input example (words could be everywhere !):

C1       TEST   PROD
A1    BE


T1     B1 

File output example(all words belonging to the same line are like in the example below):

C1,TEST,PROD
A1,BE
T1,B1 

I Found it :
%s/\s\{1,}/,/gc

Answer 1

First delete the blank lines:

:g/^\s*$/d

Then use a substitution (:s///) over each line (%) to replace all (g) continuous whitespace (\s\+) with a comma (,).

 :%s/\s\+/,/g