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struct option;
Includes following members,
Defined in option
:
flag
if not NULL, set flag to val when option found has_arg
one of no_argument, required_argument, and optional_argument: whether option tak...name
name of long option val
if flag not NULL, value to set flag to; else return value int has_arg;
one of no_argument, required_argument, and optional_argument: whether option takes an argument
int val;
if flag not NULL, value to set flag to; else return value