D. M. Ritchie and K. Thompson
UNIXis a general-purpose, multi-user, interactive
operating system for the larger Digital Equipment Corporation
the Interdata 8/32 computers.
It offers a number of features
seldom found even in larger operating
A hierarchical file system incorporating
Compatible file, device, and inter-process I/O,
The ability to initiate asynchronous processes,
System command language selectable on a per-user basis,
Over 100 subsystems including a dozen languages,
High degree of portability.
This paper discusses the nature
and implementation of the file system
and of the user command interface.
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