#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>

main(int argc, char **argv[]) {
  int done;
  int pid;
  int fds[2];
  char *cmdargv[2];

  if (argc < 3) {
    printf("USAGE: %s <cmd1> <cmd2>\n", argv[0]);
    exit(1);
  }

  pipe(fds);
    
  pid = fork();
  if (pid) {
    /* parent code */

    close(fds[1]);
    dup2(fds[0], STDIN_FILENO);
    
    cmdargv[0] = (char *)argv[2];
    cmdargv[1] = NULL;
    
    execvp((const char *)argv[2], cmdargv);
  } else {
    close(fds[0]);
    dup2(fds[1], STDOUT_FILENO);
    
    cmdargv[0] = (char *)argv[1];
    cmdargv[1] = NULL;
    
    execvp((const char *)argv[1], cmdargv);     
 
  }
    
}