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:
“Social questions are too sectional, too topical, too temporal to move a man to the mighty effort which is needed to produce great poetry. Prison reform may nerve Charles Reade to produce an effective and businesslike prose melodrama; but it could never produce Hamlet, Faust, or Peer Gynt.”
—George Bernard Shaw (1856–1950)
“Your real statesman is first of all, and chief of all, a great human being, with an eye for all the great fields on which men like himself struggle, with unflagging, pathetic hope, toward better things.... He is a guide, a counselor, a mentor, a servant, a friend of mankind.”
—Woodrow Wilson (1856–1924)