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

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

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to build a uniform symbol table
to build a literal table and an identifier table
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
None of these
to parse the source program into the basic elements or tokens of the language.

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