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Why is it that group1 which should be user's primary group, is in the subgroups? The user is not even part of group1 in /etc/group file.
# id user
uid=1000(user) gid=1111(group1) groups=1111(group1),1112(group2),1113(group3)
From my fairly new knowledge about *nix systems, isn't it that gid=1111(group1), is the primary group. While all groups under groups= is a subgroup? Then why is it by default that the primary group is being listed in groups=
groups lists all groups a user belongs to, not just all the others.
from man id:
By default, it prints the real user ID, real group ID, effective user
ID if different from the real user ID, effective group ID if different
from the real group ID, and supplemental group IDs. In addition, if
SELinux is enabled and the 'POSIXLY_CORRECT' environment variable is not
set, then print 'context=C', where C is the security context.
man id will show you: id -g will give you only primary group. id -G - all groups user belongs to. To my knowledge, there's no command that would show only supplementary groups.
groups display only supplementary group