Setting up Development Environment - Android Games Practical Programming by Example - page 7

Figure 1.4 Android SDK Installation Information
On Linux, the PATH environment variable can be defined in your ~/.bashrc ~/.bash_profile
file. If you have either of those files, use a text editor such as Gedit, VI, or Emacs to open
the file and look for a line that exports the PATH variable. If you find such a line, edit it to
add the full path of the tools directory to the path. If there is no such line, you can add a
line like this:
export PATH=${PATH}:your_sdk_dir/tools
where you put the full path in place of
your_sdk_dir.
On MacOS X, look for a file named .bash_profile in your home directory (note the initial
dot in the filename). If there is one, use an editor to open the file and look for a line that
exports the PATH variable. If you find such a line, edit it to add the full path of the tools
directory to the path. If there is no such line, you can add a line like this: