/var/list/.bin/showlist 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.
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: &&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
#########################################################################
#	showlist	To show list status and details			#
#									#
#	Created by Alan K. Stebbens <aks@hub.ucsb.edu>			#
#########################################################################
# $Id: showlist,v 1.1 1995/10/30 02:58:34 srb Exp $
echo showlist: Customise first
exit 64
# Site configuration (should be externalized)
#
domain=hub.ucsb.edu
listmaster=lists@$domain
admin="\"Mailing List Mailer-Daemon\" <$listmaster>"
#
cd $HOME
# Syntax:	showlist	[-d] [-s] [-l] [list ...]
test=test		# /bin/test
ln=ln			# /bin/ln
rm=rm			# /bin/rm
cp=cp			# /bin/cp
echo=echo		# /bin/echo
cat=cat			# /bin/cat
awk=awk			# /bin/awk
SENDMAIL=/usr/lib/sendmail
usage="usage: showlist [-d] [-s] [-l] [list ...]"
lists=
summary=1
while $test $# -gt 0
do
  case "$1" in
  -d|-debug)	debug=1 ;;
  -s|-summary)	summary=1 long= ;;
  -l|-long)	long=1 summary= ;;
  -*)	$echo $usage 1>&2 && exit 64 ;;
  *)	lists="$lists $1" ;;
  esac
  shift
done
if $test -z "$lists" ; then
    lists="`ls | tr '\012' ' '`"
fi
ifdebug () {
  if $test -n "$debug" ; then
    "$@"
  fi
}
ifndebug () {
  if $test -z "$debug" ; then
    "$@"
  fi
}
decho () {
  ifdebug echo "$@"
}
necho () {
  ifndebug echo "$@"
}
# getvar flag pattern
getvar () {
  pat="${2:-$1}"
  val="`$awk '/^'$pat'/{print \$3;exit}' $list/rc.custom $list/rc.init 2>/dev/null`"
  if $test "${val}" = "#"; then
    val="`$awk '/^'$pat'/{print \$2;exit}' $list/rc.custom $list/rc.init 2>/dev/null`"
  fi
  eval "$1=\"$val\""
}
# showvar VAR [LBL]
showvar () {
  var=$1
  lbl="${2:-$1}"
  getvar $var
  showval "$lbl" "$val"
}
# showflag VAR [LBL] (null value == "no")
showflag () {
  var=$1
  lbl="${2:-$1}"
  getvar $var
  val="${val:-no}"
  showval "$lbl" "$val"
}
# showval LBL VAL
showval () {
  lbl="${1:?'Missing label'}"
  val="${2:-$val}"
  $awk "BEGIN{printf(\"%30s: %s\n\", \"$lbl\", \"$val\")}" </dev/null
}
#######################
# Scan the lists and show a summary or details
for list in $lists
do
  # does the list exist?
  $test -d $list || continue
  listaddr=${list}@${domain}
  listreq=${list}-request@${domain}
  getvar digest_flag
  if $test -n "$summary" ; then
    echo "List \"$list\" summary:"
  else
    echo "List \"$list\" details:"
  fi
  showvar maintainer			"Owner"
  showflag X_COMMAND			"Remote commands"
  if $test -n "$X_COMMAND"; then
    showvar X_COMMAND_PASSWORD		Password
  fi
  showvar moderated_flag		"Moderated"
  showflag digest_flag			"Digested"
  $test -n "$summary" && continue
  moderators=
  if $test -f $list/moderators; then
    moderators="`(cat $list/moderators 2>/dev/null) | tr '\012' ' '`"
  fi
  showval	Moderators		"$moderators"
  showvar	unsub_assist		"Unsubscribe assistance"
  showflag	foreign_submit		"Foreign submissions"
  showflag	restrict_archive	"Restrict archive access"
  showflag	force_subscribe		"Force subscriptions"
  showflag	auto_subscribe		"Automatic subscribes"
  showflag	auto_unsubscribe	"Automatic unsubscribes"
  showflag	auto_help		"Automatic help"
  showflag	cc_requests		"Cc requests"
  showflag	cc_unsubrequests	"Cc unsubscribe requests"
  showflag	pass_diverts		"Pass diverted requests"
  showvar	reply_to		"Reply-to"
  showvar	digest_age		"Digest age limit (seconds)"
  showvar	digest_size		"Digest size limit"
  showvar	undigested_list		"Undigested list"
  showvar	size_limit		"Size limit"
  showvar	idcache_size		"ID cache size"
  showvar	archive_hist		"Archive history limit"
  showvar	archive_log		"Archive log"
  showvar	subscribe_log		"Subscribe log"
  showvar	maxhist			"Bounce history limit"
  showvar	minbounce		"Bounce minimum"
  showvar	cutoff_bounce		"Bounce text limit"
  showvar	match_threshold		"Close match threshold"
  showvar	medium_threshold	"Medium match threshold"
  showvar	loose_threshold		"Loose match threshold"
done
 |