Comment 1 for bug 288964

Thanks, but this is not a bug. To do what you want to do, you need to do the following:

echo -n 1-7:1.0 | tee -a unbind

The reason for this is that the command sequence you are using is actually 2 commands. The first command is "sudo echo -n 1-7:1.0", which is ran as root and echos the character sequence you specified. The second command is "> unbind", which re-directs the output, but this is not running as root.