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

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

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

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
the processing is much faster than would other-wise be the case when user defined commands are used
None of these
users can create system programs and run them as commands

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