Run this material somewhere disposable first. Course content is published as-is and without warranty. Many commands here change production state and can take a host off the network or destroy data if run on the wrong system, or on a version they were not written for. Check the versions each course targets, read the severity badge on a command block before running it, and keep a second session open when changing anything you connect through. No lab has been executed end to end by us. See About for the full note.
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