[Debian] How do I know if the blacklist worked?

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http://ubuntuforums.org – I realized that I had to blacklist the rt2800 because since installing Debian the internet is not working. 2 drivers are attempting the same device. So I tried Code: echo "blacklist rt2800usb" >> /etc/modprobe.d/blacklist.conf When I first executed the command I had permission denied. So I tried again. Only this time I executed su and put in my password. The terminal didn't indicate a result. Code: ztcoracat@mock:~$ echo "blacklist rt2800usb" >> /etc/modeprobe.d/.blacklist.conf bash:/etc/modprobe.d/.blacklist.conf: Permission denied So I tried su (Hardware)