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UID Ranges

UID Ranges
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Specific UID numbers and ranges of numbers are used for specific purposes by Red Hat Enterprise Linux.

• UID 0 is always assigned to the superuser account, root.
• UID 1-200 is a range of "system users" assigned statically to system processes by Red Hat.
• UID 201-999 is a range of "system users" used by system processes that do not own files on the file system. They are typically assigned dynamically from the available pool when the software that needs them is installed. Programs run as these "unprivileged" system users in order to limit their access to only the resources they need to function.
• UID 1000+ is the range available for assignment to regular users.