how to execute 'file output' node in compositing ?

Hi, i have compositing setup and have 3 ‘file output’ nodes. How can i execute or render out these ‘file output’ node ?

pressing the render button will always render the scene, not the output of those nodes.

Connect what you want to output to the file output node and render your scene

pressing the render button will always render the scene, not the output of those nodes
You can remove the composite node if you only want to render to the file output

See https://docs.blender.org/manual/fr/dev/compositing/types/output/file.html


Yes i only want to render the file output. But what do you mean ‘remove the composite node’ ? i didn’t add a ‘composite’ node in my node setup. It’s just a simple test to output intermmediate process.

Also this kind a weird , where i can’t explicitely tell the blender which ‘file output’ node that i want to execute.