Add comma after each word

Question

I have a variable (called $document_keywords) with following text in it:

Latex document starter CrypoServer

I want to add comma after each word, not after last word. So, output will become like this:

Latex, document, starter, CrypoServer

Anybody help me to achieve above output.

regards, Ankit

Answer 1

In order to preserve whitespaces as they are given, I would use sed like this:

echo "$document_keywords" | sed 's/\>/,/g;s/,$//'

This works as follows:

s/\>/,/g   # replace all ending word boundaries with a comma -- that is,
           # append a comma to every word
s/,$//     # then remove the last, unwanted one at the end.

Then:

$ echo 'Latex document starter CrypoServer' | sed 's/\>/,/g;s/,$//'
Latex, document, starter, CrypoServer
$ echo 'Latex   document starter CrypoServer' | sed 's/\>/,/g;s/,$//'
Latex,   document, starter, CrypoServer

Answer 2

A normal sed gave me the expected output,

sed 's/ /, /g' filename