what is --flat in angular code example

Example 1: generate module with routing in angular

ng g m [ModuleName] --routing

Example 2: angular cli skip-tests

The name of the TypeScript configuration file for tests. Default: ... --skipTests=true|false. When true, does not create "spec.ts" test files for the app. Default: false

While generating component using cmd
>ng g c component-name --skipTests