gistfile1.txt

<Use the down keyboard arrow to find this line:>
Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin

<Use the right arrow to move the cursor to the end of the line and press the INSERT button. Now type>
:/usr/local/bin

<In order to save your changes and exit VI, hit ESC and type>
:

<now type>
wq!

<and you're back in the console>
<in order to leave su mode, type:>
exit