Traditional Operating System Services, continued

Utility programs:

accounting, setting/constraining system resource access, manipulating the file system.

A command interface:

textual or graphical, to enable interactive interrogation and manipulation of operating system features.

System calls:

allow constrained access to the interior of the running operating system (as a program).

Protection:

keep processes from interfering with each other, their data, and "the system", whilst permitting sharing when requested.

Communication:

allow users and processes to communicate within a single machine (inter-process communication), and across networks.