/var/list/.bin/cronlist is in smartlist 3.15-22.
This file is owned by list:list, 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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42  | #! /bin/sh
: &&O='cd .' || exec /bin/sh "$0" $argv:q # we're in a csh, feed myself to sh
$O || exec /bin/sh "$0" "$@"		  # we're in a buggy zsh
#########################################################################
#	cronlist	Script called by cron at regular intervals	#
#			that performs various housekeeping tasks	#
#			related to the mailinglists			#
#									#
#	Created by S.R. van den Berg, The Netherlands			#
#									#
#	Customise to taste.						#
#	This script will not be automatically overwritten by the next	#
#	upgrade.							#
#########################################################################
#$Id: cronlist,v 1.6 1995/03/20 14:50:43 berg Exp $
test=test			# /bin/test
echo=echo			# /bin/echo
dirname=dirname			# /bin/dirname
PATH=$HOME/.bin:$HOME/.bin:$PATH:/usr/local/bin
	# make sure that the PATH provided here finds all standard utilities
	# AND formail and lockfile.
cronlist=yes			# Needed to tell flush_digests it is being
				# run from cronlist.
export PATH cronlist
a=`$dirname $0`/..
#
# Change directory to where our lists are located
#
cd $a
#
# Put all commands to be run for these lists on a regular basis below here
#
flush_digests
exit 0
 |