RHEL/Fedora auto-update & reboot

dnf-autoupdate.sh

#!/usr/bin/env bash
set -o errexit -o nounset -o pipefail
IFS=$'\n\t\v'

if [ "$EUID" -ne 0 ]; then
  echo "Attempting to re-run as root..."
  sudo "$0" "$@"
  exit
fi
echo "✅ running as root"

if ! rpm -q dnf-automatic &>/dev/null; then
  echo "installing dnf-automatic..."
  dnf install -y dnf-automatic
fi
echo "✅ dnf-automatic is installed"

TIMER_FILE="/usr/lib/systemd/system/dnf-automatic-install.timer"
sed -i -- "s|^OnCalendar=.*$|OnCalendar=*-*-* 23:00|g" "${TIMER_FILE}"
sed -i -- "s|^RandomizedDelaySec=.*|RandomizedDelaySec=5m|g" "${TIMER_FILE}"
systemctl daemon-reload
systemctl enable dnf-automatic-install.timer
echo "✅ dnf-automatic installs updates daily at 23:00"

CRON_SCHEDULE="0 0 * * 4"
CRON_COMMAND="/usr/sbin/shutdown now"
CRON_FILE="/etc/crontab"
CRON_ENTRY="${CRON_SCHEDULE} root ${CRON_COMMAND}"
if ! grep -q "${CRON_COMMAND}" "$CRON_FILE"; then
  echo "${CRON_ENTRY}" >> "${CRON_FILE}"
else
  sed -i -- "s|^.*${CRON_COMMAND}$|${CRON_ENTRY}|g" "/etc/crontab"
fi
echo "✅ system reboots every thursday at midnight"

echo "🚀 done"