for( all piped commands)
{
if (builtin)
{
execute the builtin command code here
close appropriate pipe ends to accomodate code for external commands
}
else
{
if(c->next !=NULL)
        {
            if(pipe(fd_pipe)<0)
            {
                perror("pipe");
            }
        }

        switch(pid= fork())
        {
        case -1 :
            perror("fork");
            break;
        default:
            //Close parent's copy of the write end of the pipe
            if(fd_pipe[1]>=0) close(fd_pipe[1]);

            //Store the intermediate read end which will
            //be used as read end for next process in the pipe
            //Close it for the last command as there is no one to read after it.
            if(intermed_desc >=0) close(intermed_desc);
            intermed_desc = fd_pipe[0];

            //Throw away pipe
            fd_pipe[0] = -1;
            fd_pipe[1]= -1;
            break;
        case 0 :
            // Map the intermediate read end stored to STDIN
            if(intermed_desc>=0)
            {
                if(dup2(intermed_desc, STDIN_FILENO)<0)
                {
                    perror("dup2");
                }
                close(intermed_desc);
            }
            //Map write end of pipe to STDOUT
            if(fd_pipe[1]>=0)
            {
                if(dup2(fd_pipe[1], STDOUT_FILENO)<0)
                {
                    perror("dup2");
                }
                close(fd_pipe[1]);
                close(fd_pipe[0]);
            }

                resolv_path(c,portion);
                if(execv(portion,c->args)<0)
                {
                    perror("execv");
                }

}
}