ENVS 1500 Chapter Notes - Chapter 9: Data Integrity

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ENVS 1500 Chapter 9 Notes Summary
Introduction
Security and data integrity protection
Inter user communication and shared data and programs, on multiuser and networked
systems
Information about the status of the system and its files
I/O and file services plus other specialized services for user programs
Many systems also provide utilities that can be used in place of programs to manipulate
the data within files and programs.
These utilities can be used to sort data and to retrieve data selectively from within files.
Feuetly, utilities a e oied ito pogas usig the oad
programming language to perform powerful and useful tasks.
Linux is particularly strong in this regard.
The choice of user services provided is dependent on the original focus and goals of the
operating system designers.
Finally, modern systems expand on the concept of I/O service to provide libraries of
specialized service routines
That can be used by programs to generate graphics, control a mouse, create and
manipulate user windows, generate and control menus, and perform other
sophisticated functions.
These make it easy for application programmers to supply a common-look-and-feel
interface to their programs.
The difference in skills and interests among the various users on a system affects the
design of an operating system user interface in two major areas
It affects the choice of services to be provided.
For example, powerful programming services may not be needed by the typical user
May be extremely useful to a system programmer
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