If you want to update a hyperlink field in SharePoint Online using Flow, you will need to use the Send an HTTP request to SharePoint action (for now). I first tried using the Update item Flow action but it would not correctly set the URL and Description values. One other issue I had was using the Post method as opposed to Patch. Every blog/forum post was suggesting the use of the Post method but the Patch method is what I ended up using.

For testing, create a list titled Contractors, in the list add a Hyperlink field titled website. In your Flow add a Send HTTP request to SharePoint action.

Site Address: select the site you created the Contractors list in.
Method: PATCH
Uri: _api/web/lists/getbytitle(‘Contractors’)/Items(‘ID From above Action’)
Headers
Accept application/json
Content-Type application/json; odata=verbose
X-HTTP-TYPE MERGE
IF-MATCH *
Body

{
'__metadata': { 'type': 'SP.Data.ContractorsListItem' },
   'website':
   {
          '__metadata': {'type':'SP.FieldUrlValue'},
               'Description':'Title from above Action',
                'Url': 'http://www.bbb.com'
  }
}

Peek code:

{
    "inputs": {
        "host": {
            "connection": {
                "name": "@parameters('$connections')['shared_sharepointonline']['connectionId']"
            }
        },
        "method": "post",
        "body": {
            "method": "PATCH",
            "uri": "_api/web/lists/getbytitle('Contractors')/Items('@{triggerBody()?['ID']}')",
            "headers": {
                "Accept": "application/json",
                "Content-Type": "application/json; odata=verbose",
                "X-HTTP-TYPE": "MERGE",
                "IF-MATCH": "*"
            },
            "body": "{\n'__metadata': { 'type': 'SP.Data.ContractorsListItem' },\n   'website':\n   {\n          '__metadata': {'type':'SP.FieldUrlValue'},\n               'Description':'@{triggerBody()?['Title']}',\n                'Url': 'http://www.bbb.com'\n  }\n}"
        },
        "path": "/datasets/@{encodeURIComponent(encodeURIComponent('https://EnterYourURL.sharepoint.com/sites/spdev'))}/httprequest",
        "authentication": "@parameters('$authentication')"
    },
    "metadata": {
        "flowSystemMetadata": {
            "swaggerOperationId": "HttpRequest"
        }
    }
}

A wise man recently asked me how I’d go about retrieving the five most recent modified items from every list in a farm. Fun question and there are a couple of ways of going about this, but here is what I came up with.

Things to note: 1) on prem farm with more than one web app. 2) if you are dealing with a large farm, I’d suggest chunking out the Get-SPSite -limit all and the $site.allwebs into to smaller data sets. 3) script needs comments and error handling or reporting

Clear-Host

if ($null -eq (Get-PSSnapin -Name Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue)) {
    Add-PsSnapin Microsoft.SharePoint.PowerShell
}

$sites = Get-SPWebApplication | Get-SPSite -limit all 

foreach ($site in $sites) {
    foreach ($web in $site.AllWebs) {
        $lists = $web.Lists
        foreach ($list in $lists) {
            $query = New-Object Microsoft.SharePoint.SPQuery 
            $query.Query =  
            "<Query>
                <OrderBy>
                  <FieldRef Name='Modified' Ascending='False' />
                </OrderBy>
            </Query>" 
            $query.RowLimit = 5
            $listItems = $list.GetItems($query)
            
            if ($listItems) {
                foreach ($lIem in $listItems) {
                    Write-Host "Web: $web -- List: $list -- Item: $($lIem.Name) "
                }
            }
        }
        if ($web) {
            $web.Dispose()
        }
    }
}

From my desktop, I wanted to delete all the items in a list. The list had 10,000+ items and loop through the items one at a time is slow and not efficient. This is where the batch process comes in and will help to quickly delete all the items in a large list.

In this example, I commented-out the SharePoint Online Credentials because I’m working with an on-prem environment.

The batch size is set to 1,000

#Load SharePoint CSOM Assemblies (you will need to grab these from a SharePoint server)
Add-Type -Path "C:\SharePoint DLL\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\SharePoint DLL\Microsoft.SharePoint.Client.Runtime.dll"

$SiteURL = "https://mylocalsite/sites/taco/"
$ListName = "GiantList"
$BatchSize = "1000"

Try {
    #$Cred= Get-Credential
    #$Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)

    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    #$Ctx.Credentials = $Credentials

    #Get the List
    $List = $Ctx.Web.Lists.GetByTitle($ListName)
    $Ctx.Load($List)
    $Ctx.ExecuteQuery()

    #Define Query to get List Items in the batch
    $Query = New-Object Microsoft.SharePoint.Client.CamlQuery
    $Query.ViewXml = @"

$BatchSize

"@

    #Get List Items in Batch
    Do {
        $ListItems = $List.GetItems($Query)
        $Ctx.Load($ListItems)
        $Ctx.ExecuteQuery()

        if ($ListItems.Count -gt 0) {
            for ($i = $ListItems.Count - 1; $i -ge 0; $i--) {
                $ListItems[$i].DeleteObject()
            }
            $clientContext.ExecuteQuery()
        }
        else {
            Write-Host "." -foregroundcolor black -backgroundcolor yellow
            $continue = $false;
        }

        $Query.ListItemCollectionPosition = $ListItems.ListItemCollectionPosition
    }
    While ($Query.ListItemCollectionPosition -ne $null)

}
Catch {
    write-host -f Red "Error Adding Items to List!" $_.Exception.Message
}

Limiting the number of rows returned in each query will help to avoid this error:

Exception calling "ExecuteQuery" with "0" argument(s): "The attempted operation is prohibited because it exceeds the list view threshold enforced by the administrator."

Some of the scripts were borrowed from:
http://www.sharepointdiary.com/2016/12/sharepoint-online-get-all-items-from-large-lists-powershell-csom.html

Note:
I plan to revisit this and batch processing where you combine all the delete statements into a large XML string and pass it to SharePoint for processing.