> Unix shell handles variables abysmally.  You need to help it a lot to
> do the right thing.  *Always* quote variables, else if they're empty
> they tend to blow up on you.
Thanks for the advice! Your script did work from the command line, but
it was not enough when called from extract_url.pl.
Anyway, I believe that the fix is as simple as adding %s to the COMMAND
        COMMAND /etc/urlview/url_handler.sh %s
(as suggested by Kyle) without touching anything else. I thought I had
attempted that before, but I guess now that I made some mistake (as
also suggested by Kyle). I still don't understand why %s fixes the
problem, though. Thanks everybody. 
Best regards,
Luis

-- 

                                                                  o
W. Luis Mochán,                      | tel:(52)(777)329-1734     /<(*)
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