6.3.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
int main (int argc, char *argv []) 
{ pid_t pid, pid2;
  char** fd; 
  pid = fork();
  if(pid == 0) 
  { 	
	execvp("ls", argv);
    	printf("execlp error\n");
    	exit(1) ;

  }

  waitpid(-1, NULL, 0);
 


  return 0;

}