写在前面：
对于可选参数一定要使用以下两种方法标明其值 –wValue 或--who==Value 而不能是 --who Value,
而对于必填参数则可以使用-lValue 或 --love Value或--love=Value，
这并不是bug.
//============================================================================// Name : TestOpt.cpp// Author : yangyh// Version :// Copyright : Your copyright notice// Description : Hello World in C++, Ansi-style//============================================================================#include <iostream>#include <getopt.h>using namespace std;int version;struct option longopts[] = {{ "version", no_argument, &version, 'v' },{ "name", no_argument, NULL, 'n' },{ "love", required_argument, NULL,'l' },{ "who",optional_argument,NULL,'w'},{ 0, 0, 0, 0 }};int main(int argc, char *argv[]) {int c;while ((c = getopt_long(argc, argv, "vl:w::", longopts, NULL)) != -1) {switch (c) {case 'l':printf("love ＝ %s!\n", optarg);break;case 0://printf("getopt_long()设置变量 : version = %c\n", version);break;case 'v':printf("version..\n"); break; case 'w':printf("who = %s\n",optarg);break;}}return 0;}
