/* implementing  "/usr/bin/ps -ef | /usr/bin/more" */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main()
{
	int fds[2];
	int child[2];
	char *argv[3];
	pipe(fds);
	if (fork()== 0) {
		close(fds[1]);
		close(STDIN_FILENO); dup(fds[0]); /* redirect standard input to fds[1] */
		argv[0] = "/bin/more";
		argv[1] = NULL;           /* check how the argv array is set */
		execv(argv[0], argv);
		exit(0);


	}
	if (fork() == 0) {
		close(fds[0]);
		close(STDOUT_FILENO); dup(fds[1]);  /* redirect standard output to fds[0] */
		argv[0] = "/bin/ps";
		argv[1] = "-e"; argv[2] = NULL;
		execv(argv[0], argv);
		exit(0);

	}

	close(fds[0]); close(fds[1]);
	wait(&child[0]);
	wait(&child[1]);  
	return(EXIT_SUCCESS);
}