#include <unistd.h>
   #include <stdio.h>
   #include <sys/wait.h>
   #include <sys/types.h>

   int main(int argc, char *argv[])
   {
     int status;
     pid_t child = fork();
     if (child<0)
       perror("fork");
     if (child == 0)
       {
         if (execvp(argv[1], &argv[1])<0)
           perror("execvp");
         exit(1);
       }
     waitpid(child, &status, 0);
     printf("child exited with status %x\n", status);
     exit(0);
   }