From: http://sharepointjack.com/2013/powershell-for-working-with-sharepoint-recycle-bin/

getSpRecycleBinContent.ps1

# recycle bin's are tied to a site collection so we need a site collection object

$site = get-spsite https://webapplication/sitecollection

#we can see everything in the recycle bin like this:
$site.Recyclebin

#unfortunately, the above command dumps quite a lot to the screen.
#fortunately, we can pipe the output to other commands for filtering and cleanup.

#This command will return all the webs in the recyclebin
$site.Recyclebin | where {$_.itemtype -eq "web"}

#we can build on this by adding a sort statement, 
#here I sort by dirname, which is the URL path the item would have been at before it was deleted
$site.Recyclebin | where {$_.itemtype -eq "web"} | sort dirname

# we can format the output into a nice list
$site.Recyclebin | where {$_.itemtype -eq "web"} | sort dirname | select title, itemtype, dirname, itemstate

#note that in the above listing, itemstate shows which recycle bin it's in (FirstStageRecyclebin = End user Recycle Bin Items, SecondStageRecycleBin = Deleted from end user Recycle Bin)

#here's one more application of filtering to show everything that's not a page nor a list item

$site.RecycleBin | where { $_.itemtype -ne "file" -and $_.itemtype -ne "ListItem" } | sort dirname | select title, itemtype, dirname
$site.RecycleBin | where { $_.itemtype -ne "ListItem" -and $_.dirname -like "team/jst/crm*" -and $_.itemtype -ne "FileVersion" } | sort dirname | select title, itemtype, DeletedDate, dirname | Out-GridView