No_Argument=0 : Specifies that a long option does not take an argument.
Required_Argument=1 : Specifies that a long option needs an argument.
Optional_Argument=2 : Specifies that a long option optionally takes an argument.
EndOfOptions=#255 : Returned by getopt, getlongopts to indicate that there are no more
options.
TOption = record
Name : String;
Has_arg : Integer;
Flag : PChar;
Value : Char;
end;
POption = ^TOption;
The option type is used to communicate the long options to GetLongOpts. The Name field is the
name of the option. Has_arg specifies if the option wants an argument, Flag is a pointer to a
char, which is set to Value, if it is non-nil. POption is a pointer to a Option record. It is used as
an argument to the GetLongOpts function.
OptArg:String Is set to the argument of an option, if the option needs one.
Optind:Longint Is the index of the current paramstr(). When all options have been processed,
optind is the index of the first non-option parameter. This is a read-only variable. Note that it can
become equal to paramcount+1 OptErr:Boolean Indicates whether getopt() prints error messages.
OptOpt:Char In case of an error, contains the character causing the error.