uname.c

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

int main(int argc, char *argv[]) {
        int ret_val; 
        struct utsname ubuffer;


    // Check for proper usage
    if (argc != 1) {
        fprintf(stderr, "%s: Aborting, not enough arguments.\n", argv[0]);
        return (-1);
    }

    ret_val = uname(&ubuffer);

    if (ret_val == -1)
      {
	fprintf(stderr, "%s: failed \n", strerror(errno));
        exit(1);
      }

    printf("System name: %s\n", ubuffer.sysname);
    printf("Host name: %s\n", ubuffer.nodename);
    printf("OS Release: %s\n", ubuffer.release);
    printf("OS Version: %s\n", ubuffer.version);
    printf("CPU Type: %s\n", ubuffer.machine);

    return 0;
}