# How to: Run Ping

The guide demonstrates how to create an expression that runs the system ping command and convert the command output code to a Boolean value. 

{% hint style="warning" %}
Note that calling the *runAndWait* function will immediately put the script module into demo mode if it is not licensed
{% endhint %}

Open Monokot Server Administrator and double-click *Scripts* on the *Server Explorer* pane. Click *New Expression*, set the name *LinkState* for the expression that appears and set the return data type to *BOOLEAN*. Insert the following code into the expression code editor:

```javascript
var result = MosProcess.runAndWait('ping', 'google.com -n 1', 5000);

if (result.exitCode == 0)
  return true;   

return false;
```

Press *Ctrl + Enter* to apply the change in the code editor.

Go to the *Triggers* tab, click *Add Periodic* and set a period of 10,000 ms for the trigger. In order for the changes to take effect on the server, click the Sync button. Thus, the expression will check the connection with google.com host every 10 seconds and convert the *exitCode* returned by ping to Boolean value.

You can find the full set of MosProcess functions and their descriptions [<mark style="color:blue;">here</mark>](https://docs.monokot.io/scripts/api/mosprocess).