See filter-ldjson.js for the example script.

You can read more about node.js streams (a pretty deep subject) here: https://nodejs.org/api/stream.html

There's some interesting things happening in the run-test.sh script that aren't covered in this course. You can read up on those things here:

• trap: http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_12_02.html
• while loops: http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_02.html
• backgrounding and jobs: https://www.digitalocean.com/community/tutorials/how-to-use-bash-s-job-control-to-manage-foreground-and-background-processes