My college has a server set up for students and we all have a folder for our persona stuff on it (access via ssh). So I explored it a bit and found out I can access most of the folders of other students and view its contents such as text files , folders etc but of course i cant change them without the admin permission .
Then I found some folders that cant be accessed. WHen i type "cd foldername" I get a message permission denied. So now I'm wondering can I block other people from accessing my folder on that server and how? Using console (Ubuntu 15.4) ?