Running GMT example as powershell cmdlet fault

To quote an author:

While I do recommend learning and understanding PowerShell, recommending you start with PowerShell would be like shoving you in the deep end of the ocean and telling you to swim back to
Switzerland.

Using PWSH is not my whim, but an urgent need. I do not see the PWSH troubles in this case yet. It was an attempt to combine two powerful tools in one task