4 STSADM commands for getting Site details

Get SiteCollection details

stsadm.exe -o enumsites -url  http://abc.xyz.com/ > C:\SiteCollectionDetails.txt

Get Subsite details

stsadm.exe -o enumsubwebs -url http://abc.xyz.com/ab/collab > C:\SubsiteDetails.txt

Get the permission groups

stsadm -o enumgroups -url http://abc.xyz.com/ >C:\Groups.txt

Get the permission roles

stsadm -o enumroles -url http://abc.xyz.com/ >C:\Roles.txt