rbac and privileges how begin from null or not perms

Hi Admins,

I want to restrict a user to use commands and services, for example ftp
services and rm command, I guess that the way is to put deny or close all
perms on "rbac or privileges" and then open one by one privilege, anyone
knows how can I don it? I was seeing form smc, but I don't have this
services available, and for security politics i can't run it. I think that I
have to edit some files on etc or do a command role, but I'm not sure

Thanks in advance
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