preinst is in anacron 2.3-24.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
set -e
if dpkg --compare-versions "$2" lt-nl 2.3-24; then
deb-systemd-helper purge anacron-resume.service >/dev/null
deb-systemd-helper unmask anacron-resume.service >/dev/null
fi
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