Command line options (aside from expressions)
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help [n]       Display extended help (start with page n if specified).
quit	       Exit program.
?	       Display brief help (this list).
?? [n]	       Display extended help (start with page n if specified).
? s	       Display status (output type, default bases, etc.).
? v	       Display a list of all currently assigned variables.
? c	       Display a list of all pre-assigned constants.
? f	       Display a list of available functions.
? fl	       Display a list of available functions with descriptions.
? o	       Display a list of all operators.
ibase n        Set input base to n.
obase n        Set output base to n.
sci	       Toggle scientific notation output on/off.
fix	       Toggle fixed precision on/off.
dplace n       Set the number of digits after the decimal in fixed prec.
sigfig n       Set the number of significant figures to be printed.
maxexp n       Set exponent at which output switches to sci format.
>filename      Write to script file, filename.
>	       Terminate write to script file.
<filename      Read script file, filename.
wdir dirname   Set write directory for scripts.
rpath path     Set path for reading scripts.
