The error 'command not found' means that the command is not found in the $PATH environment variable.

If you installed blender as described in the [Wiki Installing Blender on Mac](http://wiki.blender.org/index.php/Doc:2.6/Manual/Introduction/Installing_Blender/Mac). The executable `blender` is located in /Applications/Blender/blender.app/Contents/MacOS

You could simply open your terminal and enter

    cd /Applications/Blender/blender.app/Contents/MacOS
    ./blender 




    ndof: 3Dx driver not found
    found bundled python: /Applications/Blender/blender.app/Contents/MacOS/2.68/python


In order to run blender from any other location you would need to follow the instructions from [DirectoryLayout  Configuration & Data Paths](https://www.blender.org/manual/getting_started/installing_blender/directorylayout.html)

More Environment Variables
--------------------------
Run `./blender --help`


    Environment Variables:
      $BLENDER_USER_CONFIG      Directory for user configuration files.
      $BLENDER_USER_SCRIPTS     Directory for user scripts.
      $BLENDER_SYSTEM_SCRIPTS   Directory for system wide scripts.
      Directory for user data files (icons, translations, ..).
      $BLENDER_SYSTEM_DATAFILES Directory for system wide data files.
      $BLENDER_SYSTEM_PYTHON    Directory for system python libraries.
      $TMP or $TMPDIR           Store temporary files here.
      $SDL_AUDIODRIVER          LibSDL audio driver - alsa, esd, dma.
      $PYTHONHOME               Path to the python directory, eg. /usr/lib/python.