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:
“They [women] can use their abilities to support each other, even as they develop more effective and appropriate ways of dealing with power.... Women do not need to diminish other women ... [they] need the power to advance their own development, but they do not “need” the power to limit the development of others.”
—Jean Baker Miller (20th century)
“All appointments hurt. Five friends are made cold or hostile for every appointment; no new friends are made. All patronage is perilous to men of real ability or merit. It aids only those who lack other claims to public support.”
—Rutherford Birchard Hayes (1822–1893)