Just today I made a suggestion in a Github issue[0] to use sed for a similar use case. There, it was to generate an Amazon ECS task definition file from a CI tool&#x27;s environment variables. Using this, populating the list of environment variables by looping through the output of env and including anything that matches a given prefix would be a breeze.<p>Thanks for the excellent tool!<p>[0]: <a href="https:&#x2F;&#x2F;github.com&#x2F;1science&#x2F;wercker-aws-ecs&#x2F;issues&#x2F;4#issuecomment-146541641" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;1science&#x2F;wercker-aws-ecs&#x2F;issues&#x2F;4#issueco...</a>