This file is indexed.

/usr/lib/smlnj/bin/.link-sml is in smlnj-runtime 110.79-4.

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
#
# The standard "link" script for SML/NJ
#

#
# for /bin/ksh, disable reading user's environment file
#
unset ENV

#############################################################################
#
# BEGIN SITE SPECIFIC STUFF
#
#############################################################################

#
# SITE SPECIFIC CONFIGURATION INFO
#

# the path of the directory in which executables (like this file) are kept.
if [ x"$SMLNJ_HOME" = x ] ; then
    BIN_DIR="/usr/lib/smlnj/bin/"
    if [ ! -d "$BIN_DIR" ]; then
	cmddir=`dirname $0`
	case "$cmddir" in
	    /* ) BIN_DIR="$cmddir";;
	    * ) BIN_DIR=`cd $cmddir; pwd` ;;
	esac
    fi
else
    if [ x"$CM_PATHCONFIG" = x ] ; then
	CM_PATHCONFIG="$SMLNJ_HOME"/lib/pathconfig
	export CM_PATHCONFIG
    fi
    BIN_DIR="$SMLNJ_HOME"/bin
fi

# the path of the directory in which the runtime system executables are kept.
RUN_DIR=$BIN_DIR/.run

#
# the following could be replaced with some site specific code
#
ARCH_N_OPSYS=`"$BIN_DIR/.arch-n-opsys"`
if [ "$?" != "0" ]; then
  echo "$CMD: unable to determine architecture/operating system"
  exit 1
fi
eval $ARCH_N_OPSYS

#############################################################################
#
# END SITE SPECIFIC STUFF
#
#############################################################################

#
# Process command line arguments
#
RUN="$RUN_DIR/run.$ARCH-$OPSYS"
BOOT=""
HEAP="sml"
while [ "$#" != "0" ]; do
  arg=$1
  case "$arg" in
    @SMLrun=*)
      RUN=`echo "$arg" | sed 's/@SMLrun=//'`
      shift
      ;;
    @SMLboot=*)
      BOOT=`echo "$arg" | sed 's/@SMLboot=//'`
      shift
      ;;
    @SMLheap=*)
      HEAP=`echo "$arg" | sed 's/@SMLheap=//'`
      shift
      ;;
    @SMLversion)
      echo "$CMD 110.79"
      exit 0
      ;;
    *)
      break
      ;;
  esac
done

if [ ! -x "$RUN" ]; then
    echo "$CMD: cannot find runtime system $RUN"
    exit 1
fi

if [ "$BOOT" = "" ]; then
    echo "@SMLboot=<bootlist> must be specified."
    exit 1
fi

#
# run the sucker!
#
exec "$RUN" @SMLboot="$BOOT" @SMLheap="$HEAP" "$@"