USB permissions question

[Richard Kimber]

If I create a script on a USB stick plugged into my system it's
permissions are:
-rw-r--r--
If I try to make it executable with chmod u+x nothing happens, so I
can't run it.

How can I get scripts and programs to run from a USB stick? Is there a
handy guide somewhere?

I tried the advice on
https://askubuntu.com/questions/17540/how-do-i-set-executable-permissions-on-a-removable-drive
but "sudo /etc/init.d/udev restart" did not complete and return the
command prompt, so I'm not clear where to go from here.

- Richard.
-- 
Richard Kimber