Operating System (OS)
What is the function of an operating system ?

Manages the flow of data and instructions
Takes care of scheduling jobs for execution
Manages compute's resources very efficiently
All of the listed here

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

users can create system programs and run them as commands
None of these
the processing is much faster than would other-wise be the case when user defined commands are used
flexibility to the users in running lists of commands by simply collecting them in named batch command files
the command set being common across different hardware configurations

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