Would you like to hide a port until a certain knock-knock procedure is received?
Like this:
knock3000 4000 5000 && ssh -puser@host && knock5000 4000 3000
Knock on ports to open a port to a service (ssh for example) and knock again to close the port.
Running applications automatically when X starts
The majority of people who use Debian upon the desktop launch straight into the X11 Window system, usually via one of the choosers xdm, gdm, or kdm. Once you’ve entered your username and password you get your Window Manager running and are ready to start work. But what if you want a program or two to start as soon as you login?
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