[SOLVED] bash how to manipulate string with variables

Issue

So I am trying to accomplish a string substitution but is not working for me. This is my bash script so far:

d=1
message=('{"message":$d}')
echo $message

But the output is

{"message":$d}

I know the reason is because of the single quotes surrounding the {} but that is required for my purposes. Is there any workaround for this?

Solution

You can do this like that:

$ d=1
$ message='{"message":'"$d"'}'
$ echo "$message"
{"message":1}

Answered By - Arkadiusz Drabczyk