When is a folder not a folder?
Usually this is an Alias of a folder. An alias is normally marked with a litte arrow a the left lower corner.

Example:



-rw-r--r--@  1 user  staff  1938832 31 Okt 16:54 Car
drwxr-xr-x   3 user  staff      102 31 Okt 16:56 Car1
-rw-r--r--@  1 user  staff      178 31 Okt 16:56 Car2


Car is an Alias, Car1 a folder, Car2 is a text file without suffix but with the icon of a folder though.

To enable cd'ing into an Alias I've found the following at Mac OS X Hints. Don't know if it still works.


  Here is the bash function I include in .bashrc. Note that the second elif       requires double brackets for the test, because it include the logical operator     or (||):


function cd {
  if [ ${#1} == 0 ]; then
    builtin cd
  elif [ -d "${1}" ]; then
    builtin cd "${1}"
  elif [[ -f "${1}" || -L "${1}" ]]; then
    path=$(getTrueName "$1")
    builtin cd "$path"
  else
    builtin cd "${1}"
  fi
}



  And here's the C source code for getTrueName. 


A similar approach is available at superuser.com