#include <stdio.h>
#include <string.h>
#include <sys/utsname.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
  FILE *cpu;
  char buff[100];
  int i, s, n, r, v, m, c, a, h, o, z;
  struct utsname unameget;
  uname(&unameget);

  s = n = r = v = m = c = h = a = z = 0;

  if (argc < 2) s = z = 1;
  else while((o = getopt(argc, argv, "snrvmcah")) != -1)
        switch(o) {
          case 's': s = z = 1; break;
          case 'n': n = z = 1; break;
          case 'r': r = z = 1; break;
          case 'v': v = z = 1; break;
          case 'm': m = z = 1; break;
          case 'c': c = z = 1; break;
          case 'a': a = z = 1; break;
          case 'h': h = 1; break;
        }

  if (h) {
    printf("usage: %s [-snrvmcah]\n\t-s\tOS name\n\t-n\tnetwork node name\n\t-r\tOS release\n\t-v\tOS version\n\t-m\tmachine type\n\t-c\tcpu name\n\t-a\tall information\n\t-h\tthis help\n", argv[0]);
    return 0;
  }

  if (a) s = n = r = v = m = c = 1;

  if (s) printf("%s ", unameget.sysname);
  if (n) printf("%s ", unameget.nodename);
  if (r) printf("%s ", unameget.release);
  if (v) printf("%s ", unameget.version);
  if (m) printf("%s ", unameget.machine);
  if (c) {
    if ((cpu = fopen("/proc/cpuinfo", "r")) != NULL) {
      while(!feof(cpu)) {
        memset(buff, 0, sizeof(buff));
        fscanf(cpu, "model name      : %s", buff); fgetc(cpu);
        if (strcmp(buff, "") != 0) printf("%s", buff);
      }
      fclose(cpu);
    }
  }
  if (z) printf("\n");
  return 0;
}