For example, this one-liner finds the first name of all
inetOrgPerson classes within the People
organizational unit that have a uid that starts with the
string “ma”:
irb> dir.ou( :people ).filter( :objectClass => 'inetOrgPerson' ).filter( :uid => 'ma*' ).collect {|branch| branch[:givenName].first }.sort # => ["Mahlon", "Margaret", "Margaret", "Mark", "Marlon", "Matt", "Mike", "Mimi"]