You're still having problems because you didn't do what you were asked to do. pc88mixer asked you to redirect stdout in the system call to something else, like /dev/null, so that the output was not 'attached' to the cgi process. Closing stdout in the perl script isn't the same thing.

In reply to Re^3: system command not working after connection with cgi breaks by dwm042
in thread system command not working after connection with cgi breaks by advait

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