How would `echo dd if=linux.iso of=/dev/sda` protect you from nuking the wrong drive? To be sure you aren’t overwriting the wrong drive, you need to read the co

How would `echo dd if=linux.iso of=/dev/sda` protect you from nuking the wrong drive? To be sure you aren’t overwriting the wrong drive, you need to read the command before executing it — and you don’t need echo for that, just pause for a second before hitting Enter — and you need to know which drive is which, and that requires running a different command, or using eg. /dev/disk/* instead of /dev/sd??.