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== Effective vs. real == Unix processes have an [[effective user ID|effective]] (EUID, EGID), a [[real user ID|real]] (UID, GID) and a [[saved user ID|saved]] (SUID, SGID) ID. Normally these are identical, but in <code>[[setuid]]</code> and <code>[[setgid]]</code> processes they are different.
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