Crontab in ArchLinux

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1. Install Crontab in ArchLinux

	$ pacman -S cronie

2. Enable the cronie at startup.

	$ systemctl enable cronie.service
	$ systemctl start cronie.service
	# Display the crontab jobs
	$ crontab -l

3. Edit the crontab jobs:

	MAILTO=your@email
	LOGFILE=/var/log/cron-pacman.log
	
	# 1. minute (0-59)
	# |   2. hour (0-23)
	# |   |   3. day of month (1-31)
	# |   |   |   4. month (1-12)
	# |   |   |   |   5. day of week (0-7: 0 or 7 is Sun, or use names)
	# |   |   |   |   |   6. commandline
	# |   |   |   |   |   |
	#min hr  dom mon dow command
	00   13   *   *   *  . /etc/profile && (echo; date; yes |pacman -Syuq) &>>$LOGFILE || (echo 'pacman failed!'; tail $LOGFILE; false)
	00   13   *   *   *  updatedb && date>>/root/done.txt

4. Now your job will be done automatically.