[2013-12-04 22:12:40 -0600] David C. Rankin:
One question though, the USERGROUPS_ENAB flag seems self-explanatory, but the comments above the flag say:
# # Enable setting of the umask group bits to be the same as owner bits # (examples: 022 -> 002, 077 -> 007) for non-root users, if the uid is # the same as gid, and username is the same as the primary group name. # # This also enables userdel to remove user groups if no members exist. #
So, in addition to insuring umask group bits are the same as owner bits for non-root users, this setting controls whether new users are automatically added to the 'users' group by default with useradd?
See the man page to useradd: "If not specified, the behavior of useradd will depend on the USERGROUPS_ENAB variable in /etc/login.defs. If this variable is set to yes (or -U/--user-group is specified on the command line), a group will be created for the user, with the same name as her loginname. If the variable is set to no (or -N/--no-user-group is specified on the command line), useradd will set the primary group of the new user to the value specified by the GROUP variable in /etc/default/useradd, or 100 by default." -- Gaetan