Is it safe to remove/change system user account on Red Hat Enterprise Linux ?

Solution Verified - Updated 2023-02-27T01:51:27+00:00 -

Issue

Is it safe to remove system users (user accounts having a UID less than 500 for RHEL 6 and below and less than 1000 for RHEL 7 and above) in order to "harden" the servers?
Is it OK to change the primary group of system users?
Need to identify unused system accounts for deletion as per security requirements
How to remove/delete/disable following default(standard) system user(s) accounts : sync, shutdown, halt, ftp, gopher, uucp, operator, pcap(used by tcpdump),
To remove system account (users/groups) with GID(gid) equal to 0(zero)
To disable system User/Group ID(s)
To set the password expiry for the System owned IDs

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