[eschwartz]

and I have a script called "calibre-upgrade" that looks like this:

#!/bin/bash

calibre-debug -c "import urllib as u; from calibre.constants import numeric_version; raise SystemExit(int(numeric_version  < (tuple(map(int, u.urlopen('http://calibre-ebook.com/downloads/latest_version').read().split('.'))))))"

UP_TO_DATE=$?

if [ $UP_TO_DATE = 0 ]; then
	echo "Calibre is up-to-date"
else
	calibre --shutdown-running-calibre
	killall calibre-server
	sudo python -c "import sys; py3 = sys.version_info[0] > 2; u = __import__('urllib.request' if py3 else 'urllib', fromlist=1); exec(u.urlopen('http://status.calibre-ebook.com/linux_installer').read()); main()"
fi

Which corresponds to a line in my crontab that looks like this:

0 6 * * 5 /home/schwartze/bin/calibre-upgrade > /dev/null 2>&1

I then go my merry way in sublime confidence that calibre will always be up-to-date.