Computer and Programming

One set of operating-system services provides functions that are
helpful to the user:
User interface – Almost all operating systems have a user interface (UI)
Varies between Command-Line (CLI), Graphics User Interface
(GUI), Batch
Program execution – The system must be able to load a program into
memory and to run that program, end execution, either normally or
abnormally (indicating error)
I/O operations – A running program may require I/O, which may involve
a file or an I/O device
File-system manipulation – The file system is of particular interest.
Obviously, programs need to read and write files and directories, create
and delete them, search them, list file Information, permission
management.
Operating