#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

/**
 * Executes the command "grep Villanova < scores > out".
 *
 * @author Jim Glenn
 * @version 0.1 9/23/2004
 */

int main(int argc, char **argv)
{
  int in, out;
  char *grep_args[] = {"grep", "Villanova", NULL};

  // open input and output files

  in = open("scores", O_RDONLY);
  out = open("out", O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR);

  // replace standard input with input file

  dup2(in, 0);

  // replace standard output with output file

  dup2(out, 1);

  // close unused file descriptors

  close(in);
  close(out);

  // execute grep

  execvp("grep", grep_args);
}