/usr/bin/xgfmerge is in xgridfit 2.3-1.
This file is owned by root:root, 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 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | #!/bin/bash
UTIL_PREFIX=/usr/share/xml/xgridfit/utils/
PARAMLIST=''
RESOLVE_XINCLUDES=1
FILE_A=''
SORT_OUTPUT=1
VERBOSE=1
ECHO_TIME=1
usage() {
    cat <<Here-is-the-usage-text
usage: xgfmerge [options] file-a file-b [...]
Options:
  -c       Ignore globals in files other than file-a when value of
           "compile-globals" default is "no"
  -h       Display this help message
  -n       Include <no-compile> element
  -o file  Write result to file (otherwise to stdout)
  -p       Prefer <pre-program> from file other than file-a
  -s       Sort glyph elements in output
  -v       Verbose messages
  -x       Resolve XIncludes (except from file-a)
Here-is-the-usage-text
}
parseopts () {
  while getopts "cEhno:psvx" optname
    do
    case "$optname" in
	"c")
	    PARAMLIST=$PARAMLIST" --stringparam use-compile-globals yes"
	    ;;
	"E")
	    ECHO_TIME=0
	    ;;
	"h")
	    usage
	    exit 0
	    ;;
	"n")
	    PARAMLIST=$PARAMLIST" --stringparam skip-b-no-compile no"
	    ;;
	"o")
	    OUTFILE=$OPTARG
	    ;;
	"p")
	    PARAMLIST=$PARAMLIST" --stringparam prep-mode priority"
	    ;;
	"s")
	    SORT_OUTPUT=0
	    ;;
	"v")
	    VERBOSE=0
	    ;;
	"x")
	    RESOLVE_XINCLUDES=0
	    ;;
	"\?")
            usage 1>&2
            exit 1
            ;;
	":")
            usage 1>&2
            exit 1
            ;;
	*)
            usage 1>&2
	    exit 1
            ;;
    esac
  done
  return $OPTIND
}
runscript () {
    START_TIME=`date +"%s"`
    if [ $# -lt 2 ]
    then
	echo "You must supply the names of at least two files." 1>&2
	echo "Type \"xgfmerge -h\" or \"man xgfmerge\" for help." 1>&2
	exit 1
    fi
    if [ $VERBOSE -eq 0 ]
    then
	echo "Settings: " 1>&2
	if [ ${#OUTFILE} -gt 0 ]
	then
	    echo "Output will be written to $OUTFILE" 1>&2
	fi
	if [ $RESOLVE_XINCLUDES -eq 0 ]
	then
	    echo "XIncludes will be resolved in all files except $1" 1>&2
	fi
	if [ $SORT_OUTPUT -eq 0 ]
	then
	    echo "Output will be sorted" 1>&2
	fi
    fi
    for f in $@
    do
	if [ ${#FILE_A} -eq 0 ]
	then
	    FILE_A=$f
	    if [ ! -f "$FILE_A" ]
	    then
		echo "Can't find file $FILE_A" 1>&2
		exit 1
	    fi
	    CURRENT_A=$FILE_A
	else
	    FILE_B=$f
	    if ! echo $FILE_B | grep -q "^\/"
	    then
		FILE_B=`pwd`'/'$FILE_B
	    fi
	    if [ ! -f "$FILE_B" ]
	    then
		echo "Can't find file $FILE_B" 1>&2
		exit 1
	    fi
	    if [ $VERBOSE -eq 0 ]
	    then
		echo "Merging $CURRENT_A and $FILE_B" 1>&2
	    fi
	    DELTMP=1
	    if [ $RESOLVE_XINCLUDES -eq 0 ]
	    then
		if grep -q "http://www\.w3\.org/2001/XInclude" $FILE_B
		then
		    TMP_X_FILE=`$MKTEMP_CMD` || exit 1
		    xsltproc --stringparam file-a $FILE_A ${UTIL_PREFIX}xinclude.xsl $FILE_B | \
			xmllint --xinclude - >> $TMP_X_FILE
		    if [ $VERBOSE -eq 0 ]
		    then
			echo "$FILE_B with XIncludes written to $TMP_X_FILE" 1>&2
		    fi
		    FILE_B=$TMP_X_FILE
		    DELTMP=0
		fi
	    fi
	    TMP_RESULT=`$MKTEMP_CMD` || exit 1
	    if [ $VERBOSE -eq 0 ]
	    then
		echo "Result will be written to $TMP_RESULT" 1>&2
	    fi
	    CMD="xsltproc --stringparam file-b $FILE_B $PARAMLIST ${UTIL_PREFIX}merge.xsl $CURRENT_A >> $TMP_RESULT"
	    if [ $VERBOSE -eq 0 ]
	    then
		echo "executing $CMD" 1>&2
	    fi
	    eval $CMD
	    if [ $DELTMP -eq 0 ]
	    then
		if [ $VERBOSE -eq 0 ]
		then
		    echo "Removing $TMP_X_FILE" 1>&2
		fi
		rm -f $TMP_X_FILE
	    fi
	    if [ $FILE_A != $CURRENT_A ]
		then
		if [ $VERBOSE -eq 0 ]
		then
		    echo "Removing $CURRENT_A" 1>&2
		fi
		rm -f $CURRENT_A
	    fi
	    CURRENT_A=$TMP_RESULT
	fi
    done
    OUTCMD="cat $TMP_RESULT"
    if [ $SORT_OUTPUT -eq 0 ]
    then
	OUTCMD=$OUTCMD" | xsltproc ${UTIL_PREFIX}sort-glyphs.xsl -"
    fi
    OUTCMD=$OUTCMD" | xmllint --format -  | sed -f ${UTIL_PREFIX}add-blanks.sed"
    if [ ${#OUTFILE} -gt 0 ]
    then
	OUTCMD="$OUTCMD > $OUTFILE"
    fi
    if [ $VERBOSE -eq 0 ]
    then
	echo "executing $OUTCMD" 1>&2
    fi
    eval $OUTCMD
    if [ $VERBOSE -eq 0 ]
    then
	echo "Removing $TMP_RESULT" 1>&2
    fi
    rm -f $TMP_RESULT
    END_TIME=`date +"%s"`
    if [ $ECHO_TIME -eq 0 ]
    then
	echo "Finished in "$(( $END_TIME - $START_TIME ))" seconds" 1>&2
    fi
}
if [ $# -lt 2 ]
    then
    usage 1>&2
    exit 1
fi
if uname | grep -q "Darwin"
then
    MKTEMP_CMD='mktemp -t xgfmerge'
else
    MKTEMP_CMD='mktemp -t xgfmerge.XXXXXXXXXX'
fi
parseopts "$@"
argstart=$?
runscript "${@:$argstart}"
 |