2629	 The UNIX Time-Sharing system	 UNIX is a general-purpose multi-user interactive operating system for the Digital Equipment Corporation PDP- and computers. It offers a number of features seldom found even in larger operating systems including a hierarchical file system incorporating demountable volumes compatible file device and inter-process I O the ability to initiate asynchronous processes system command language selectable on a per-user basis and over subsystems including a dozen languages.This paper discusses the nature and implementation of the file system and of the user command interface. time-sharing operating system file system command language PDP-
