[mondobe]

Reading the title, I thought this was going to be about a backdoor in the Unix program...

[hagbard_c]

That'd be a bit of a non-sequitur as cat would not be of much use if it weren't for its ability to use its ear [1].

[1] see /dev/stdin or &1 - cat only listens in mono

[cupantae]

My assumption was something like environmental variables - how much a simple command like cat is listening to your computer