automagically update your archlinux

script.sh

# /etc/systemd/system/update.timer
[Unit]
Description=Perform a full upgrade once a week (at 12:00pm on Monday)

[Timer]
OnCalendar=Mon *-*-* 12:00:00
Persistent=true

[Install]
WantedBy=timers.target

# /etc/systemd/system/update.service
[Unit]
Description=Upgrade system
ConditionACPower=false

[Service]
Type=oneshot
ExecStart=/usr/local/bin/update.sh
After=network-online.target
Wants=network-online.target

# /usr/local/bin/update.sh 
#!/bin/bash

echo "waiting for internet avaibility..."

ping google.com -c 2 > /dev/null 2>&1
while [ $? -ne 0 ];do
        ping google.com -c 2 > /dev/null 2>&1
done

echo "[OK] connected"
echo "starting update..."
pacman -Syyuu --noconfirm > /dev/null 2>&1
echo "[OK] update completed"
echo "Have a great day :)"