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

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

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Operating System (OS)
Scheduling is

not required in uniprocessor systems
the same regard-less of the purpose of the system
None of these
allowing jobs to use the processor
unrelated to performance consideration

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