Install rmate

rmate.sh

# Check effective user, and if not root/0, ask for password up front to avoid interactive prompt along the way.
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root to download rmate to /usr/local/bin/ and make it executable." 
   sudo -v
fi

# Silently download rmate (implemented as shell script)
sudo curl -sSo /usr/local/bin/rmate https://raw.githubusercontent.com/aurora/rmate/master/rmate
 
# Make executable
sudo chmod +x /usr/local/bin/rmate

Added sudo before curl
Added -sS flags after curl
English comments

Check effective user, and if not root/0, ask for password up front to avoid interactive prompt along the way.

Run this gist from shell via:

curl -sS https://gist.githubusercontent.com/arbal/299ecd37a9fac613cdbdb3db5ed27ff0/raw | sudo bash