Last login: Mon Oct 3 16:03:30 on ttyp1 Welcome to Darwin! michael-riveras-computer:~ michaelrivera$ cd /usr/local/bin michael-riveras-computer:/usr/local/bin michaelrivera$ ls bison yacc michael-riveras-computer:/usr/local/bin michaelrivera$ which bison /usr/bin/bison michael-riveras-computer:/usr/local/bin michaelrivera$ ls bison yacc michael-riveras-computer:/usr/local/bin michaelrivera$ cd bison -bash: cd: bison: Not a directory michael-riveras-computer:/usr/local/bin michaelrivera$ ls bison bison michael-riveras-computer:/usr/local/bin michaelrivera$ which bison /usr/bin/bison michael-riveras-computer:/usr/local/bin michaelrivera$