If you are new to Linux, chances are you will meet a stupid person perhaps in a forum or chat room that can trick you into using commands that will harm your files or even your entire operating system. To avoid this dangerous scenario from happening, I have here a list of deadly Linux commands that you should avoid.
rm -rf /
This command will recursively and forcefully delete all the files inside the root directory.
Whole article here: TECH SOURCE FROM BOHOL: The 7 Deadly Linux Commands