To set an environment variable The following command sets the value of the "PARAM1" variable in the "my-env" environment to "ParamValue": aws elasticbeanstalk update-environment --environment-name my-env --option-settings Namespace=aws:elasticbeanstalk:application:environment,OptionName=PARAM1,Value=ParamValue The option-settings parameter takes a namespace in addition to the name and value of the variable. Elastic Beanstalk supports several namespaces for options in addition to environment variables.