程序代码：

#include <stdio.h>
#include <string.h>
main()
{
   char c[128]={0};
   FILE *fp;
   fp=fopen("iptables.sh","r");
   fgets(c,128,fp);
   fgets(c,128,fp);
   fgets(c,128,fp);
   if(feof(fp))
        printf("error\n");
   fgets(c,128,fp);
   while(!feof(fp))
    {
        printf("%s\n",c);
        fgets(c,128,fp); 
    }
}