The operating system provides several key services to programs and users, including user interface, program execution, input/output operations, file system management, communications, error detection and handling, resource allocation, accounting, protection, command interpretation, and resource management. These services allow for running programs, performing input/output, creating and managing files, connecting between processes, detecting and handling errors, tracking usage for billing, protecting processes from each other, interpreting user commands, and optimizing resource usage.

1. Basics of Operating Systems : Operating System Services
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2. Recap
In the last class, you have learnt about
• Multi processor System
• Operating System Components
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3. Objectives
On completion of this period, you would be able
to know
• Operating System Services
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4. Operating System Services
• The operating system provides certain services to
programs and to the user of those programs
• These services include
– User interface
– Program execution
– I/O operations
– File system management

5. Operating System Services
– Communications
– Error detections and handlings
– Resources allocations
– Accounting
– Protection
– Command interpretation
– Resource management
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6. Operating System Services

7. Operating System Services
User interface
• All Operating Systems have a user interface. Types
of user Inter faces are
• Command –line interface, Batch inter face, GUI
Program execution
• Starting of programs, managing their execution and
communicating their results

8. Operating System Services
I/O operations
• Mechanism for initiating and managing I/O operation
File system management
• Creating, maintaining and manipulating files
Communications
• Between processes of the same user and different users
Error detections and handlings
• Protection related issues
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9. Operating System Services
• Safety in the case of power failures via backups
• Detecting and desirable states such as printer out of
papers
Resources allocations
• Includes processor and I/O scheduling, memory
management
Accounting
• To track user usage of resources for billing and statistical
reasons
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10. Operating System Services
Protection
• One process must be protected from another
Command interpretation
• User entered commands will be interpreted and
appropriate action will be performed
Resource management
• The various resources of the system are
managed in an optimal way
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11. Summary
• The operating system provides certain services to
program and to the user of those programs
• These services include
– Program execution and handling
– I/O operations
– File system management
– Communications
– Exceptions detections and handlings
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12. Frequently Asked Question
1. Write and Explain operating system services
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13. Quiz
1. User entered commands will be interpreted
and appropriate action will be performed by
using Command interpreter
a) Yes
b) No
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14. Quiz
• Resources allocations Includes processor
and I/O scheduling, memory management
a) Yes
b) No
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15. Other subject materials
• Web designing
• Micro processors
• C++ tutorials
• java
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