Ubuntu 16 - reliably find node processes and take conditional action

findnodeprocesses.sh

#!/bin/sh

NODEPROCESSES=$(ps -aux | grep '[s]udo nohup node index.js' | awk '{print $2}')

if [ -n "$NODEPROCESSES" ]; then
	echo "Found node processes $NODEPROCESSES"
else
	echo "No node processes found"
fi

Of course, this presupposes node has been run as a background process from directly from a shell, or from a shell script, rather than as a service.