separate fields by comma using bash

Question

How do I place commas between fields?

Input data

12123 \'QA test case 1\' \'QA environment\'   
12234 \'UAT test case 1\' \'UAT environment\'  
         


        

Answer 1

$ sed "s/ '/,&/g" file
12123, 'QA test case 1', 'QA environment'
12234, 'UAT test case 1', 'UAT environment'