How to log Javascript output in Linux and Windows LGs

I use a Javascript to log some details(variables, correlated data) and write output a file. For the load test I use Windows server as controller and combination of Windows and Linux(Ubuntu) LGs.

I wanted to understand how output of javascript gets logged in Ubuntu LGs?

Ex – Per https://www.neotys.com/blog/best-solutions-saving-values-..., output path can be set incase of windows LGs as below –
var writer = new java.io.FileWriter(“c:\\log.txt”,true);

How can set location and access the logs if I use combination of Windows and Linux LGs?

Is there a way to instruct Controller to copy over the output logs to Controller from all the LGs at the end of load test?