A website asks me to paste a command to prove I am human. Is that safe?

Reviewed answer

No. A human-verification page should not require running commands on your computer.

Close the page. Do not paste or run its instructions in Run, PowerShell, Terminal, or another command window.
If you already ran a command, disconnect the device from the internet and stop using it for sensitive accounts.
Use another trusted device to secure important accounts. Contact the affected device's official support for malware recovery.

Get help if

You executed the command, even if nothing obvious happened. Information-stealing software may run quietly.