Prerequisites:
SharePoint Online Management Shell: https://www.microsoft.com/en-us/download/details.aspx?id=35588
PnP – PowerShell Cmdlets: https://github.com/officedev/pnp-powershell/releases
PowerShell Script:
Open SharePoint Online Management Shell and execute the following script.
## Connects to a SharePoint Site
Connect-SPOnline -Url https://c986.sharepoint.com -Credentials (Get-Credential)
## Syntax: Get-SPOField [-List <ListPipeBind>] [-Web <WebPipeBind>] [-Identity <FieldPipeBind>]
## Returns a field from a list or site
Get-SPOField -List "Custom" -Identity "Multi"
##Disconnects the context
Disconnect-SPOnline