Ok so:
rule "Get weater station data"
when
Time cron "1 * * ? * * *" // Every minute at 1 second past
then
executeCommandLine("cp /home/pi/CumulusMX/realtime.txt /etc/openhab2/html/realtime.txt", 5000) //Copies the file into the html shared folder
Thread::sleep(500) // give time for the system to copy the file
val String rawWeather = sendHttpGetRequest("http://localhost:8080/static/realtime.txt")
logInfo("RAW DATA", rawWeather)
val weatherArray = rawWeather.split("_")
Pressure.postUpdate(weatherArray.get(10))
...
end