@MaPePeR: of course we all understood that. The problem is that your question simply cannot be answered.
You're asking for a "blacklist", but what you really want is a "whitelist". This is the same problem as anti-virus vendors have: there is a way to enumerate what will definitely brick your device (I gave you one example), but this enumeration cannot, ever, be exhaustive. And conversely, there is no way to enumerate what will not brick your device.
But, for instance, the "pwd" command should be a reasonably safe one to be on the whitelist.
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