How to set the number of UID which is less than the largest UID in /etc/password automatically when a new user is creating by command useradd?

Solution Verified - Updated -

Issue

  • A specific UID has been assigned to a user in a system, then all newly created users' UID will be larger than this specific UID. How to set the number of UID which is less than the largest UID in /etc/password automatically when a new user is creating by command useradd?

Environment

  • Red Hat Enterprise Linux (RHEL) 7
  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 5

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