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scripts/usr/local/bin/script-system-scheduled-restart

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+#!/usr/bin/env bash
+# Update and restart the system
+# Copyright 2021-2025 Bryan C. Roessler
+# Licensed under the Apache License, Version 2.0
+p="${BASH_SOURCE[0]%/*}"; [[ -r $p/script-functions ]] && . "$p"/script-functions || exit 1
+
+is_root
+
+[[ $# -eq 0 ]] && time='*-*-* 01:30:00' # 1:30AM
+[[ $# -gt 1 ]] && time="$*"
+
+script-system-update
+
+ask_ok "Set a scheduled reboot for $time?" || exit 1
+
+cat <<- EOF > "/usr/lib/systemd/system/scheduled-reboot.timer"
+	[Unit]
+	Description=Scheduled reboot
+
+	[Timer]
+	OnCalendar=$time
+	Unit=reboot.target
+
+	[Install]
+	WantedBy=timers.target
+EOF
+
+systemctl daemon-reload
+systemctl start scheduled-reboot.timer
+
+# Current date
+dt=$(date '+%d/%m/%Y %H:%M:%S');
+
+msg_part1="System restart scheduled for $time."
+msg_part2="The current time is $dt."
+msg_part3="Make sure all changes are saved."
+message="$msg_part1 $msg_part2 $msg_part3"
+
+# Graphical notification
+IFS=$'\n'
+for LINE in $(w -hs); do
+    USER=$(echo "$LINE" | awk '{print $1}')
+    USER_ID=$(id -u "$USER")
+    DISP_ID=$(echo "$LINE" | awk '{print $8}')
+    sudo -u "$USER" DISPLAY="$DISP_ID" DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/"$USER_ID"/bus notify-send "$message" --icon=dialog-warning
+done
+
+# Wall notification
+wall -n "$message"