System Administration, including: Bastard Operator From Hell, Cygwin, Sysop, System Request, Time-sharing, Unix Shell, Simple Network Management ... Unix Security, Usenix, Superuser, Toor

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More info: A system administrator, systems administrator, or sysadmin, is a person employed to maintain and operate a computer system and/or network. System administrators may be members of an information technology (IT) or Electronics and Communication Engineering department.