Founder of https://commando.io. It is utterly frightening that anybody would consider using c99. If you're interested in a parallel SSH web-based interface, check us out. Commando.io does not provide an interactive shell, but instead operates through pre-defined scripts we called recipes (written in shell, bash, perl, python, ruby, go, or node.js). Recipes are fully versioned, and we keep a full audit trail of all executions run on your infrastructure.
People are messing with you because C99 is used almost exclusively by script kiddies as a web shell into servers they compromise. Almost no one has ever used it as an actual administration shell for their own servers.
Or we could, you know, use SSH (and sudo if we were so inclined). I don't think anyone uses a PHP shell willingly unless they're trying to do something they shouldn't.
