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The purpose of this document, and its companion, the “UNIX Operating System Source Code”, is to present in detail that part of the UNIX time-sharing system which we choose to call the “UNIX Operating System”, namely the code which is permanently resident in the main memory during the operation of UNIX. This code has the following major functions:
initialisation;
process management;
system calls;
interrupt handling;
input/output operations;
file management.
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