This file is indexed.

/usr/lib/yp/ypxfr_1perday is in nis 3.17-34ubuntu3.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /bin/sh
#
# ypxfr_1perday    Transfer all NIS maps from the master
#                  in case we missed an update.
#                  (Or if we don't get automatic updates).
#
# Version:         @(#)ypxfr_1perday.sh  1.00  MvS
#

if [ -f /etc/default/nis ]; then
	. /etc/default/nis
fi

YPBINDIR=/usr/lib/yp

if [ "${NISSERVER}" != "slave" ]; then
	exit 0
fi

if [ "${NISMASTER}" = "" ]; then
	NISMASTER=$(/usr/bin/ypwhich -m 2>/dev/null | awk '{print $2}' | head -1)
fi

MAPS=$(${YPBINDIR}/yphelper --maps ${NISMASTER})

for map in $MAPS
do
  [ -t 1 ] && echo "$YPBINDIR/ypxfr $map"
  $YPBINDIR/ypxfr $map
done