Run command as Rest API - body of the API call documentation not clear

I was following this documentation and trying to run a simple shell script in a vm using this.

https://docs.microsoft.com/en-us/rest/api/compute/virtual%20machines%20run%20commands/runcommand#runcommandinputparameter

But what needs to be the content of the body of the post request is not clear. The commandID can be RunShellScript but where doe we provide the script value.

```
script: 'scriptname'
script: 'sh scriptname'

```

and other each resulting in

{
"error": {
"code": "BadRequest",
"message": "Error converting value \"/home/adminwm/quick-python-test.sh\" to type 'System.Collections.Generic.List`1[System.String]'. Path 'script', line 3, position 52.",
"target": "runCommandInput.script"
}
}