How to enable ssh proxy every time I resume desktop I start ssh proxy by a command similar to the following when I login to the desktop.

ssh -N awsproxy.vpc


Also, I need to type this every single time I resume my desktop from sleep mode. Can you tell me any automated way to switch ssh proxy on if you know, please?
SleepWatcher will let you run shell scripts when the computer goes to sleep and wakes up.

There are step-by-step instructions at http://theglenbot.com/sleep-and-wake-scripting-osx/ but the premise is pretty simple, there's one script which runs when the computer is going to sleep, and another one which runs when it is waking up.

However, I would also recommend checking out Keyboard Maestro which can trigger events off system wake and a lot of other criteria, and it's a lot easier and more fun to use.