ldap_uniq.rb

## Code binds to LDAP, searches users, returns multi-dimensional array for groups like so.
## Each element in the array represents a given users AD groups
## user_groups = [ [group1,group2], [group2,group3], [group2,group4] ]

My goal here is to get the common groups among all of the arrays and the only way I've found so far is this:

user_groups[0] & user_groups[1] & user_groups[2]
=> [group2]


Unfortunately, that's pretty static and only works for 3 users and I'm too dumb to think of a clever way to do this better.