This file is indexed.

/usr/share/Crack/scripts/fbmerge is in crack-common 5.0a-11.

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
###
# This program was written by and is copyright Alec Muffett 1991,
# 1992, 1993, 1994, 1995, and 1996, and is provided as part of the
# Crack v5.0 Password Cracking package.
#
# The copyright holder disclaims all responsibility or liability with
# respect to its usage or its effect upon hardware or computer
# systems, and maintains copyright as set out in the "LICENCE"
# document which accompanies distributions of Crack v5.0 and upwards.
###

trap "" 1 2  15

fbdir=run
ofile=F-merged
sfile=XF-merged
tfile=TF-merged$$

if [ ! -d $fbdir ]
then
    mkdir $fbdir || exit 1
 exit 0
fi

cd $fbdir || exit 1

files="`echo [FD]*`"

if [ "$files" = "[FD]*" -o "$files" = "$ofile" ]
then
    exit 0 # nothing to do
fi

cat [FD]* >> $sfile

rm -f F*

awk -F: < $sfile '
$1 == "!fb!" {
    password[$2] = $4
    hits++
    next
}
$1 == "F" {
    password[$2] = $3
    hits++
    next
}
$1 == "G" {
    password[$3] = $4
    hits++
    next
}
END {
    if (hits)
    {
	for (ciphertext in password)
	{
	    print "F:" ciphertext ":" password[ciphertext];
	}
    }
}' |
sort |
uniq > $tfile

mv $tfile $ofile && rm $sfile

exit 0