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

int main(int argc, char ** argv, char ** envp)
{
        int pid;
        int cp[2]; /* Child to parent pipe */
        char ch;
        int incount = 0, outcount = 0;

        if( pipe(cp) < 0)
        {
                perror("Can't make pipe");
                exit(1);
        }


        /* Create a child to run command. */
        switch( pid = fork() )
        {
                case -1: 
                                perror("Can't fork");
                                exit(1);
                case 0:
                                /* Child. */
                                close(1); /* Close current stdout. */
                                dup( cp[1]); /* Make stdout go to write
                                                   end of pipe. */
                                close(0); /* Close current stdin. */
                                close( cp[0]);
                                execvp(argv[1], argv + 1);
                                perror("No exec");
                                exit(1);
                default:
                                /* Parent. */
                                printf("\nOutput from child:\n");
                                close(cp[1]);
                                while( read(cp[0], &ch, 1) == 1)
                                {
                                        write(1, &ch, 1);
                                        outcount++;
                                }
                                exit(0);
        }

	exit(0);
}