If something requires root, alias will run "sudo command" instead of that command.
Running only command will only say "This must be run as root." But there is one
expection. Nmap-traceroute doesn't require root, but it will say "traceroute requires
root, cancelling" and tells that the host is up (or down depending on it). I added sudo
for it, because we usually want to see traceroute if we want traceroute.
This is the longest commit message which I have ever written. Maybe I will write
longer someday...
