Effective Vs. Real
Unix processes have an effective (EUID, EGID), a real (UID, GID) and a saved (SUID, SGID) ID. Normally these are identical, but in setgid processes they are different.
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Famous quotes containing the words effective and/or real:
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—Thomas S. Kuhn (b. 1922)
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—Sarah Fielding (1710–1768)