Low-level parsing, revisited

• gettoken allows token-by-token low-level parsing
• Useful for two-word commands
  
  
  • Pull a subcommand off of the original command line
  • Put the rest of the original command line back in `0' for high-level parsing

            . mycmd6 sum mpg weight if foreign
    
            program define mycmd6              /* `0'      : sum mpg weight if foreign */
                version 6.0
                gettoken subcmd 0 : 0          /* `subcmd' : sum                       */
                                               /* `0'      : mpg weight if foreign     */
                syntax [varlist] [if] [in]     
                if "`subcmd'" == "sum" {
                    ...
                }
                ...
            end
    

    This is similar to the following in Perl:

            ($subcmd,$zero) = split(/ /,$zero,2) ;