Execute the following command in the terminal, then open a new terminal window and the `blender` command should work as expected:

    echo "alias blender=/Applications/Blender/blender.app/Contents/MacOS/blender" >> ~/.profile

What this command does is add the following line to the end of `/Users/SteveW/.profile`:

    alias blender=/Applications/Blender/blender.app/Contents/MacOS/blender

I strongly recommend to not mess with `PATH` or any other environment variable for this, it only makes things more complicated, there's no reason to do so when you set up the alias correctly.

On recent versions of macOS, `.profile` is not used. Use `~/.bash_profile`  instead. 

    echo "alias blender=/Applications/Blender/blender.app/Contents/MacOS/blender" >> ~/.bash_profile