Operating System (OS)
The command interpreter

is menu drive
is usually the primary user interface
None of these
requires fixed format commands
is quite different from the SCL interpreter

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Operating System (OS)
All of the following are task performed by the operating system except

Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU
Provides an interface for user to interact with computer
Managing hardware on the computer

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