A/UX 3.x provided a graphical user interface with the familiar Finder windows, menus, and controls. The A/UX Finder was not the same program as the System 7 Finder, but a customized version adapted to run as a Unix process and designed to interact with the Unix kernel and file systems. A/UX 3.x also included a CommandShell terminal program, which offered a command line interface to the underlying Unix system, a feature which had never been available on Macintosh computers running the classic Mac OS Finder. An X Window System server application (called MacX) with a terminal program could also be used to interface with the system and run X applications directly in the Finder. Alternatively, the user could choose to run a full X11R4 session without the Finder.
By including a compatibility layer, A/UX could run Macintosh System 7.0.1, Unix, and "hybrid" applications. A hybrid application used both Macintosh and Unix system functions: for example, a Macintosh application which called Unix system functions, or a Unix application which called Macintosh Toolbox (e.g. QuickDraw) functions. The compatibility layer used some existing Toolbox functions in the computer’s ROM, while other function calls were translated into native Unix system calls.
A/UX included a utility called Commando (similar to a tool of the same name included with MPW) to assist users with entering Unix commands. Opening a Unix executable file from the Finder would open a dialog box that allowed the user to choose command-line options for the program using standard controls such as radio buttons and check boxes, and display the resulting command line argument for the user before executing the command or program. This feature was intended to ease the learning curve for users new to Unix, and decrease the user’s reliance on the Unix manual. A/UX also had a utility that allowed you to reformat third party SCSI drives in a way such that they could be used in other Macs of that era.
A/UX users had one central source for most A/UX applications, a server at NASA called “Jagubox” administered by Jim Jagielski, who was also the editor of the A/UX FAQ. Although Jagubox is down, some mirrors are still maintained.
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