CommandNotFoundAction.ps1

   $ExecutionContext.InvokeCommand.CommandNotFoundAction =
   {
      param(
        [string]
        $commandName,
    
        [System.Management.Automation.CommandLookupEventArgs]
        $eventArgs
      )
    
      Write-Warning "Command $commandName was not found."
     
      # populate a command otherwise you'll also get the normal command not found error
      # note that the command you're replacing here will be executed, so using `Select-Object`
      # which will quietly exit
      $eventArgs.Command = (Get-Command Select-Object)
      # stop searching
      $eventArgs.StopSearch = $True
     
    }