Linux操作系统的程序命令行处理分析

短形式    长形式             含义

－h       ――help           打印帮助信息

－s       ――server         服务器IP地址

－b       ――background     后台执行

const struct option long_options [] =={
{“help ”,0,NULL,‘h ’ }},
{“server ”,1,NULL,‘s ’ }},
{“background”,0,NULL,‘b ’ }},
{NULL,0,NULL,0 }
};

#include 
#include 
#include 
const char*program_name;
void print_usage (FILE*stream,int exit_code)
{
fprintf (stream,“Usage:%s options [ inputfile ....]
 ”,program_name);
fprintf (stream,
“ -h --help Display this usage information.
 ”
“ -s --server ip Set the server IP.
 ”
“ -b --background run in the backgound.
 ”);
exit (exit_code);
}
int main (int argc,char*argv [])
{
int next_option;
const char*const short_options =“hs:b ”;
const struct option long_options [] =={
{“help ”,0,NULL,‘h ’ }},
{“server”,1,NULL,‘s ’ }},
{“background ”,0,NULL,‘b ’ }},
{NULL,0,NULL,0 }
};
const char*output_filename =NULL;
int verbose =0;
program_name =argv [0 ];
do {
next_option =getopt_long (argc,argv,short_options,
long_options,NULL);
switch (next_option)
{
case ‘h ’:/*-h or --help */
print_usage (stdout,0);
case ‘s ’:/*-o or --output */
//ip =optarg;
break;
case ‘b ’:/*-v or --verbose */
break;
case ‘?’:/*The user specified an invalid option.*/
code one (indicating abnormal termination).*/
print_usage (stderr,1);
case -1:/*Done with options.*/
break;
default:/*Something else:unexpected.*/
abort ();
}
}
while (next_option !=-1);
/*The main program goes here.*/
return 0;
}