The suggested path should be '/usr/local/bin/' and not '/usr/bin/' as '/...

The suggested path should be '/usr/local/bin/' and not '/usr/bin/' as '/usr/local/' is for user installed items like this.

More details in this Unix question & answer thread on Stack Exchange. http://unix.stackexchange.com/questions/4186/what-is-usr-local-bin-came-across-it-in-an-script-installation-for-applescript