diff --git a/sortnetif/install.sh b/sortnetif/install.sh
index 1b19afd..0bdba21 100755
--- a/sortnetif/install.sh
+++ b/sortnetif/install.sh
@@ -12,14 +12,14 @@ if [ "${1}" = "patches" ]; then
   ETHLIST=""
   ETHX="$(ls /sys/class/net/ 2>/dev/null | grep eth)" # real network cards list
   for ETH in ${ETHX}; do
-    MAC="$(cat /sys/class/net/${ETH}/address 2>/dev/null | sed 's/://g' | tr '[:upper:]' '[:lower:]')"
+    MAC="$(cat /sys/class/net/${ETH}/address 2>/dev/null | sed 's/://g; s/.*/\L&/')"
     BUS="$(ethtool -i ${ETH} 2>/dev/null | grep bus-info | cut -d' ' -f2)"
     ETHLIST="${ETHLIST}${BUS} ${MAC} ${ETH}\n"
   done
   ETHLISTTMPM=""
   ETHLISTTMPB="$(echo -e "${ETHLIST}" | sort)"
   if [ -n "${2}" ]; then
-    MACS="$(echo "${2}" | sed 's/://g' | tr '[:upper:]' '[:lower:]' | tr ',' ' ')"
+    MACS="$(echo "${2}" | sed 's/://g; s/,/ /g; s/.*/\L&/')"
     for MACX in ${MACS}; do
       ETHLISTTMPM="${ETHLISTTMPM}$(echo -e "${ETHLISTTMPB}" | grep "${MACX}")\n"
       ETHLISTTMPB="$(echo -e "${ETHLISTTMPB}" | grep -v "${MACX}")\n"