Using Environment Variables in cURL Command - Unix

Question

My question is very simple. I want to use environment variables in a cURL command sth similar to this:

curl -k -X POST -H \'Content-Type: application/json\' -d \         


        

Answer 1

curl -k -X POST -H 'Content-Type: application/json' -d '{"username":"'$USERNAME'","password":"'$PASSWORD'"}'

Here the variable are placed outside of "'" quotes and will be expanded by shell (just like in echo $USERNAME). For example assuming that USRNAME=xxx and PASSWORD=yyy the argv[7] string passed to curl is {"username":"xxx","password":"yyy"}

And yes, this will not work when $USERNAME or $PASSWORD contain space characters.