This file is indexed.

postinst is in at 3.1.18-2ubuntu1.

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.

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#!/bin/sh
set -e

if [ "$1" = "configure" ]; then
    SEQFILE=/var/spool/cron/atjobs/.SEQ
    if [ ! -f $SEQFILE ]; then
	echo 0 > $SEQFILE
	chmod 600 $SEQFILE
	chown daemon:daemon $SEQFILE
    fi
fi

# Automatically added by dh_systemd_enable
# This will only remove masks created by d-s-h on package removal.
deb-systemd-helper unmask atd.service >/dev/null || true

# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled atd.service; then
	# Enables the unit on first installation, creates new
	# symlinks on upgrades if the unit file has changed.
	deb-systemd-helper enable atd.service >/dev/null || true
else
	# Update the statefile to add new symlinks (if any), which need to be
	# cleaned up on purge. Also remove old symlinks.
	deb-systemd-helper update-state atd.service >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/atd" ]; then
		update-rc.d atd defaults 89 11 >/dev/null
	fi
	if [ -x "/etc/init.d/atd" ] || [ -e "/etc/init/atd.conf" ]; then
		invoke-rc.d atd start || exit $?
	fi
fi
# End automatically added section