You can run the file recSubs.js from the command line using node. Specify both the version you want (unindented=0, indented=1) and the string you want to use.

For those not familiar with the command line, it's as simple as navigating to the directory and running the following command

node recSubs.js 1 abcd

Concretely, here's what each component of that command line does.

node recSubs.js

uses node to run the file recSubs.js.

1 and abcd 

are argments that are available in process.argv. The 1 specifies that you want to use indented version and 'abcd' sets 'abcd' as the starting string.

Anthony