Shell Programming and Scripting

The "against each file with the .index extension" makes it sound like you want the .index in the pathname you pass to loadutility. The sample invocation of loadutility you provided does not include the .index.

You haven't said anything about what directory you should be in when you run loadutility and the examples you have been given make varying assumptions about whether or not you just want the final component of the pathname passed to loadutility as its last operand and whether or not the .index should be included.

I will make a different set of assumptions and you can let us know if any of us came close to what you're trying to do:

Code:

#!/bin/bash
BASEDIR=/some/where

cd "$BASEDIR/data/files" || exit 1

EC=0
OIFS=$IFS

for FILE in *.index
do	if ! [[ -f $FILE ]]
	then	printf '%s: file "%s" not found\n' "${0##*/}" "$FILE" >&2
		exit 2
	fi
	printf '%s: Processing file "%s"\n' "${0##*/}" "$FILE"
	BASE=${FILE%.index}

	IFS=.
	FIELDS=( $BASE )
	IFS=$OIFS

	echo loadutility -a "${FIELDS[2]}" -g "${FIELDS[3]}" "$BASE"
	if [[ $? -ne 0 ]]
	then	EC=3
	fi
done
exit $EC

As with the other suggestions, the echo causes this to print what it is planning to do, but does not actually run loadutility. At least now you have several different examples of ways to approach what we think you're trying to do.