I've done it myself, I generally avoid it by using `shutdown -r` instead which will by default delay reboot for 1 minute (at least it does on CentOS/RHEL 7). It

I've done it myself, I generally avoid it by using `shutdown -r` instead which will by default delay reboot for 1 minute (at least it does on CentOS/RHEL 7). It's annoying to wait the extra time, but having a period to backout with a `shutdown -c` in case I made a mistake has saved me more than it hasn't. On the flip side, at least when you make this mistake with a VM you're typically not down for long assuming you have fast-ish storage - on average any of the VM's I'm responsible for are back up in 60-90 seconds, physical machines can take 5 minutes or more (memory testing, expansion ROM's, etc. all make post take FOREVER even on modern hardware).