The -r option with the groupadd command is used for creating a system group. A system group is typically used for running system services and system users; it is not intended for login users. Therefore, it's important for administrators to understand and use this option appropriately in the context of system security and user management.
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What is the purpose of a system group?
How does the `-r` option affect group creation?
Can you provide examples of services that might use system groups?