/**
 * To run the program:
 * ./a.out program arg1 arg2 arg3 ... 
 * Two IMPORTANT things:
 * First: How to use portion of the argv
 * Second: The first element of the argv in the execvp invocation
 *         needs to be the name of the child process
 */

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

int main(int argc, char *argv[]) {
  char *program = argv[1];
  /* the argv[] which will be given to the child 
     process must have the "child program name" as
     the argv[0], so argv only need to increase by 1 */
  argv++;
  int pid;
  if ((pid = fork()) == -1) {
    printf("fork failed!\n");
    exit(1);
  } else if (pid == 0) {
    /* child */
    execvp(program, argv);
  } else {
    /* parent */
    wait(0);
  }
  return 0;
}