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What is the difference between SPWeb and SPSite? I have this code using SPWeb

$web = Get-SPWeb http://mysite ForEach($list in $web.Lists) { if($list.BaseType -eq "DocumentLibrary") { Write-Host $list.Fields if($list.Fields.ContainsField("marking") -eq $true) { Write-Host "found" $list.Title } } }

Which doesn't produce the right result, as apparently GPMS marking is not a column for a Document Library. But when I use this code using SPSite 

Get-SPSite mysite | Select -ExpandProperty AllWebs | Select -ExpandProperty Lists | where {$_.GetType().Name -eq "SPDocumentLibrary"} | Select -ExpandProperty Fields | Select Title | out-file test.txt

This has the so called marking column that I want to search for in the previous bit of code. Is there anyway of changing the previous bit of code so it does find the marking column?

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    SPSite represents a site collection while SPWeb represents a specific web site within the site collection. Normally, you open a specific SPWeb within SPSite via SPSite.OpenWeb(). You can use SPSite.AllWebs to enumerate existing webs, or SPSite.RootWeb. Commented Jun 6, 2014 at 10:39
  • So your site name is same for both the cases?? Commented Jun 6, 2014 at 11:05

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You need to start of with the tree ;)

You have a farm (SPFarm) and in that farm you have many web applications (SPWebApplication), within one of those web applications you would have a site collection(SPSite) and within that site collection you would have many sub sites (SPWeb) that hold many sites (SPWeb) or in your case webs (SPWeb) under the site colleciton.

from a url perspective:

http://webApplication(SPWebApplication)/siteCollection(SPSite)/web(SPWeb)

coding wise in your case your calling an spweb on a toplevel spsite. coding wise if you want to get the spweb object you need to note that its rootweb ;) as your mysite is based at the sitecollection and not at the subsite or site level!

http://msdn.microsoft.com/en-gb/library/microsoft.sharepoint.spsite.rootweb.aspx

$site = Get-SPSite http://mysite $site.RootWeb.Lists
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Your example is a bit ambiguous. One example deals with just 1 SPWeb at a specific location, the other with an SPSite, as you say, but you pipe ALL the subwebs of that SPSite (and even subwebs within subwebs I believe). So it may be that you find the field in a completely different SPWeb under the SPSite, where before you were just checking 1 specific SPWeb under the SPSite.

So most likely that field was not deployed to "http:// skynet" but a different SPWeb.

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