I was so sure of myself, I thought I knew about permissions. Until someone asked me this.
Having these users:
User Group ---- ----- juan juan pedro pedro maria maria jose jose miguel miguel eric eric lola lola paola paola
/opt/privado with Owner =
juan 111 pedro 110 maria and jose 101 miguel and eric 100 lola 000
There are no common permissions for creating a group
myGroup and assigning, for example, 110 because I have different permissions for a different group of users. How can this be done on Unix? Really the issue is for Linux, but maybe it is the same solution.