`cd` is not a command; it is built into your shell. Some systems, like OS X and CentOS, map the cd man page to builtin which lists all the shell builtins and l

`cd` is not a command; it is built into your shell. Some systems, like OS X and CentOS, map the cd man page to builtin which lists all the shell builtins and lets you know you should look at your shell's man page.