findProductPictures.sh

#!/bin/bash

echo Searching in $1
echo ... based on $2
echo ... and copying to $3

mkdir -p $3

SUFFIX="_a.jpg"

cat $2 | while read LINE
do
	# Skip empty lines
	if [ -z "$LINE" ]; then
		continue
	fi

	FILE=$LINE$SUFFIX
	# Search + copy file and stop after first match
	find $1 -type f -name $FILE | head -n 1 | xargs -I {} cp {} $3

	# Print line if item was no found
	COPY=$3"/"$FILE
	if [ ! -f $COPY ]; then
		echo $LINE
	fi
done