Pastejacking
This is why I always copy a command into TextEdit (or Notepad on Windows) first, and then re-copy the clean text before pasting into my terminal.While we are on the topic of copying and pasting. If the command downloads a script, make sure you download the script out-of-step via curl first, review its contents, and only then execute it. This avoids sites maliciously changing the script based on the User Agent.