: READ.ME : The techinque used here is : 1. Get the template of the running stack into a dump.json file 2. Pick changes from change.properties 3. Run update_stack with --template-body file:///dump.json along with changed parameters from the change.properties file Example change.properties ParameterKey=environmentType,UsePreviousValue=true ParameterKey=DBPassword,UsePreviousValue=true How to run the script (while your stackname is MyStack): ./reparse_value.sh MyStack