A

administrator

A user on the system with ultimate power to configure the system. Usually under standard Linux installations, this is another word for either the root user or one who has adopted that user’s powers temporarily.

AIX

IBM’s proprietary form of UNIX that runs on the company’s proprietary hardware, as well as commodity hardware based around AMD and Intel processors. Nowadays, IBM is slowly deprecating AIX in favor of Linux.

alias

Method of creating a user-defined command that, when typed, causes another command to be run or a string to be expanded.

Apache

Popular open source web server software that runs on UNIX, Linux, and other operating system platforms. Considered responsible in part for the rise in popularity of Linux in the late 1990s.