diff -ruN udev-018.orig/extras/ide-devfs.sh udev-018/extras/ide-devfs.sh
--- udev-018.orig/extras/ide-devfs.sh	2004-02-19 19:38:37.000000000 +0100
+++ udev-018/extras/ide-devfs.sh	2004-02-21 17:57:06.000000000 +0100
@@ -8,7 +8,7 @@
 TARGET="${2#[0-9]\.}"
 
 if [ -z "${HOST#[13579]}" ]; then
-	HOST=`expr ${HOST} - 1`
+	HOST=$((${HOST} - 1))
 	BUS="1"
 else
 	BUS="0"
@@ -24,7 +24,7 @@
 		if [ -e "${x}" ]; then
 			MEDIA=`cat ${x}`
 			if [ "${MEDIA}" = "$2" ]; then
-				num=`expr ${num} + 1`
+				num=$((${num} + 1))
 			fi
 			if [ "${x}" = "/proc/ide/${DRIVE}/media" ]; then
 				break
@@ -32,7 +32,7 @@
 		fi
 	done
 	
-	echo `expr ${num} - 1`
+	echo $((${num} - 1))
 }
 
 if [ -z "$3" ]; then