Unhorking Raspbian

raspiuser

# raspiuser
#
# Having a fixed username / password combination is generally considered
# insecure. This script renames the default 'pi' user to one of your own
# choosing (please choose a name other than 'pi'.) Run it as root, passing
# the new username as the first parameter:
#
#   sudo ./raspihork testuser
#

if [ $# -lt "1" ]
then
  echo "Usage: $0 <new username>"
  exit 1
fi

NEWU=$1
addgroup --system nopasswd
adduser pi nopasswd
echo '%nopasswd ALL=(ALL) NOPASSWD: ALL' > /etc/sudoers.d/nopasswd
chown root /etc/sudoers.d/nopasswd
chmod 440 /etc/sudoers.d/nopasswd
sed /etc/sudoers -i -e 's/^pi/#&/'
for file in /etc/group /etc/gshadow; do
  echo $file
  sed $file -i -e "s/:pi/:$NEWU/"
done
for file in /etc/passwd /etc/shadow; do
  echo $file
  sed $file -i -e "s/^pi/$NEWU/"
done
sed /etc/passwd -i -e "s/\/home\/pi/\/home\/$NEWU/"
mv /home/pi /home/$NEWU