No need to create a one line "script" if you have access to /usr/bin/ directory. Simply create a symbolic link to /usr/bin from your limewire binary (executable for newbies). Here is my command to create as I suggest:

(Do this as root if you can't add anything as a regular user to this directory)

ln -s /home/ndiscreet/LimeWireLinux/LimeWire /usr/bin/limewire


Now, all you have to type is limewire from any directory in order to run LimeWire.

HTH

altoine