GI_DUMP_FILE="..."
GI_TAXID_FILE="..."
NEW_GI_TAXID_FILE="..."

if [ -f $NEW_GI_TAXID_FILE ]; then
 rm $NEW_GI_TAXID_FILE;
fi

for LINE in `cat $GI_TAXID_FILE`; do
	GI = `echo $LINE  | egrep -o '^[0-9]*' | sed 's/^[ \t]*//' | sed 's/[ \t]*$//'`;

	for LINE_ in `cat $GI_DUMP_FILE | egrep -o '[0-9]*$' | sed 's/^[ \t]*//' | sed 's/[ \t]*$//'`; do
	if [ "$GI" == "$LINE_" ]; then
		echo $LINE >> $NEW_GI_TAXID_FILE;
	fi

	done
	cd $HAUPTDIR
done

---------------------------------------------------------

 xrealloc: subst.c:4072: cannot reallocate 1073741824 bytes (0 bytes allocated)