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This is a #define for the flag character used to
specify an option on the command line. If value was not
specified for the option, then it is a unique number associated
with the option. option value refers to this value,
option argument refers to the (optional) argument to the
option.
switch (WHICH_OPT_OTHER_OPT) {
case VALUE_OPT_NAME:
this-option-was-really-opt-name;
case VALUE_OPT_OTHER_OPT:
this-option-was-really-other-opt;
}