#6 syntax?

When I came across challenge 6, I was pleasantly surprised because I'm familiar with *nix commands, and I thought it would be a breeze. I easily found the directory, and typed in what I thought would be the right commands, but it didn't work. I looked at 15+ posts on challenge 6, changed a few minor differences, and tried again. It didn't work. Can someone let me PM them with my commands and tell me what's wrong?

I've done this and recently retryed it and for some reason it wouldn't work, you can PM me with what you've got though