void do_with_pipe(char **argv1,char **argv2)
{
	    int pid1,pid2;
	    int pipe1[2];
	    if(pipe(pipe1)<0)
	    {
		    perror("pipe failure");
		    exit(EXIT_FAILURE);
	    }
	    pid1=fork();
	    if(pid1<0)
	    {
		    perror("fail to fork");
		    exit(1);
	    }
	    else if(pid1==0)
	    {
		    pid2=fork();
	            if(pid2<0)
		    {
			    perror("fail to fork");
			     exit(1);
		    }
		    if(pid2==0)
		    {
		           if(dup2(pipe1[0],STDIN_FILENO)==-1)
		 		       perror("fail to dup");
			    close(pipe1[0]);
			    close(pipe1[1]);
		 	    execvp(argv2[0],argv2);
		    } 
		    else{
			    if(dup2(pipe1[1],STDOUT_FILENO)==-1)
				    perror("fail to dup");
			    close(pipe1[0]);
			    close(pipe1[1]);
			    execvp(argv1[0],argv1);
	           }
	    }
	    else{
		    if(waiting)
			    waitpid(pid1,NULL,0);
		    else
			    waiting=YES;
	    }
}