/etc/apm/event.d/anacron is in anacron 2.3-24.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #! /bin/sh
# This script makes anacron jobs start to run when the machine is
# plugged into AC power, or woken up. For a laptop, these are the
# closest parallels to turning on a desktop.
# The /etc/init.d/anacron script now normally tries to avoid running
# anacron unless on AC power, so as to avoid running down the battery.
# (Things like the slocate updatedb cause a lot of IO.) Rather than
# trying to second-guess which events reflect having or not having
# power, we just try to run anacron every time and let it abort if
# there's no AC. You'll see a message on the cron syslog facility
# (typically /var/log/cron) if it does run.
case "$1,$2" in
change,power|resume,*)
/usr/sbin/invoke-rc.d anacron start >/dev/null
;;
esac
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