Irix
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Irix is a BSD-based Unix Operating System developed by SGI to run natively on their 32- and 64-bit MIPS architecture workstations and servers. Irix was one of the first Unix flavors to feature a GUI for the main desktop environment and is used widely due to extremely high performance 3D graphics.
Irix handled software conflicts nonconventially - where two or more software packages conflict with each other, the system administrator is forced to manually enter conflict resolution commands, such as:
conflicts 1a 2a 3a