sblock.cron

#!/bin/sh
# this file should be installed in /etc/cron.daily .
# if a cron implementation is installed on the machine,
# this will be run once a day.

# if flock exists, use it to make sure
# only one instance of sblock is running.
if command -v flock >/dev/null; then
    ( flock -n "$(command -v sblock)" sblock & ) >/dev/null 2>&1
else
    ( sblock & ) >/dev/null 2>&1
fi