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A system administrator describes someone responsible for running, or running some aspect of, a computer system.
The precise meaning varies. Organisations with very large or complex computer systems typically divide up computer staff according to specialism, in which case a system administrator ("sysadmin") is someone responsible for the maintenance of the existing computer system, and who is specifically not :
But may (particularly in smaller organisations) include much of the job description given in the separate articles listed above.
See also: BOFH, PFY, SAGE (organization), System Administrator Appreciation Day.