[Trisquel-users] Re : Trisquel Noob Here

[lcerf]

UNIX files have owners. More precisely the meta-data of any file includes a  
user id (uid for short) and, as its name suggests, the user id identifies a  
user. If you use different users (potentially on different systems) with  
different uids, then the file that belongs to you with a user does not belong  
to you with the other user. It matters because the owner may have permissions  
on the file (encoded as well in the meta-data on the file) that other users  
do not have. For instance, the owner may be allowed to modify the file,  
whereas the other users cannot do that.