Powershell script to get Site Collection. Site Owner, Title

Question

Hi,
I am new to SharePoint, currently I have given one task to create the powershell script which contains the below fields from our two farms. Could you please help me out with the same.
The script to list out below items:
Site Collections:
Site Collection Name:
Site Collection Owners:
Last Activity and the size of site collections.
Many Thanks & Best Regards,
Naren

Answer 1

To get all Site Collections:
If all you want is a list of all site collections in the farm, all you have to do is open a PowerShell window, load the SharePoint Snapin, if you haven't (Add-PSSnapin
Microsoft.SharePoint.PowerShell), and type Get-SPSite.
If you want to return the list of site collections for a specific web application, the easiest way is to just pipe it as Get-SPWebApplication
http://intranet | Get-SPSite
To get Site Collection Owners:
Add-PSSnapin "Microsoft.SharePoint.Powershell" -ErrorAction SilentlyContinue
Get-SPWebApplication "http://mySharePointSite.com"|
Get-SPSite| foreach-object{ Write-host$_.Url - $_.Owner.Email}
To get Size of all Site Collections:
Get-SPSite | select url, @{label"Size in MB";Expression={$_.usage.storage/1MB}} | Sort-Object
-Descending -Property "Size in MB" | ConvertTo-Html -title "Site Collections sort by size" | Set-Content sc.html
Regrading the retrieving the last activity I am not sure to what exactly you are looking for but I assume you are concern about getting users last logon time and date using PowerShell.
For this refer here: Get Users Last Logon Time and Date using PowerShell
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