A command like ~/dlang/install.sh install ldc,dub installs ldc and a corresponding version of dub. However, install.sh does not support commands here other than dub. For instance, a call like ~/dlang/install.sh install ldc,dmd will return errors like Downloading and unpacking https://github.com/dlang/dub/releases/download/v/dub-v-linux-x86_64.tar.gz curl: (22) The requested URL returned error: 404 Instead, there should be a check that anything after the comma starts with dub and have an error if it is not. Alternately, it could loop through anything comma'ed so that the above command installs both ldc and dmd.