Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
always requires several programs
None of these
is not required if the system is well written
is usually not necessary

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

None of these
the command set being common across different hardware configurations
users can create system programs and run them as commands
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

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