This works ---> it will run as a cgi program and
display 'hello' in the browser;
now, if I add one line in the beginning
it will work in the command line, but if I try
to display 'hello' in the browser, it will automatically
redirect to some 'foo.example.com' and tell me
'This page cannot display'.
Thanks to others for all the replies. I reply this
one as it is easier for me to describe the problem.
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Want more info? How to link
or How to display code and escape characters
are good places to start.