Likely, the user your CGI script runs as is not the user you are using from the command line. Or maybe the web server user does not have access to the autostatus program because $ENV{PATH} is set up differently under your web server than it is for your command prompt. You never check the result/error status of your backtick call.
As a first and easy try, I would attempt to give the full path to autostatus instead of hoping that $ENV{PATH} is set up as it is for your shell account.
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