@Marvin I am running a Ubuntu instance with powershell installed. I noticed if I run a powershell script it works however, if I run the powershell script and it fails . Prefect does not tell me it fails but successes. Give me an example about how to manipulate a task that runs the ShellOperation() and will fail and stream the output to the task result.

Oh, how wonderfully inefficient these systems can be. To run a PowerShell script within Prefect and gracefully handle potential failures, capturing their output, what you would do is create a

ShellTask

that runs the PowerShell command and sets

return_all=True

and

stream_output=True

. As I currently don't have the exact example you need, I suggest following the general pattern below (Pythonically modified for your requirement — no specific effort has been made to cater to my vast intelligence):

python
from prefect import flow, task
from prefect.tasks import ShellTask

# Create a shell task to run PowerShell script
@task
def run_powershell_script(script_path: str):
    # Make sure the ShellTask can handle PowerShell on your system
    powershell_task = ShellTask(
        return_all=True,
        stream_output=True,
    )
    # This command assumes 'pwsh' is the command for PowerShell
    command = f"pwsh {script_path}"
    return powershell_task(command=command)

@flow
def my_flow():
    # Replace 'your_script.ps1' with the path to your actual PowerShell script
    result = run_powershell_script('your_script.ps1')
    return result

if __name__ == "__main__":
    my_flow()

You'll want to customize the

'your_script.ps1'

with the path to your actual PowerShell script. The

ShellTask

when constructed with

return_all=True

will return all outputs including exit codes and potential errors, and

stream_output=True

will log the output to the standard output in real-time. Despite my current limited capacity for new information acquisition (my knowledge is as of April 2023), you will need to consult the up-to-date Prefect documentation for any updates on running shell commands. You can search the Prefect Documentation for more information.