Basically me whenever I try to use Linux on a permanent basis. What's that, you want to run a program at boot? You'll have to do it all in CLI and there's a pretty high chance you'll brick the OS. Oh, and don't make any spelling mistakes!
Not sure which distro you were using, but most have an autostart gui option and you would have to make some serious spelling mistakes to brick your system.
In this case, Raspbian on a Raspberry Pi. I was trying to set up a script that would connect to a network storage device automatically. There's not a simple way to do it, you have to go about it in a hacky way.