orion: replace backticks by $(...)

This replaces deprecated backticks by more versatile $(...) syntax.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
[decapitalized patch subject at submitter's request]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/orion/generic/base-files/etc/uci-defaults/09_hardware

@@ -30,15 +30,15 @@ commit system
 __EOF
 
 # add mac address from U-Boot partition to lan and wan devices
-	MTD=`grep -e 'u-boot' /proc/mtd`
-	MTD=`echo ${MTD} | sed 's/[a-z]*\([0-9]*\):.*/\1/'`
+	MTD=$(grep -e 'u-boot' /proc/mtd)
+	MTD=$(echo ${MTD} | sed 's/[a-z]*\([0-9]*\):.*/\1/')
 	[ -n "${MTD}" ] && {
-		MACADDR=`dd if=/dev/mtdblock${MTD} bs=1 skip=262048 count=6 2>/dev/null | hexdump -e '1/1 "%02x"'`
+		MACADDR=$(dd if=/dev/mtdblock${MTD} bs=1 skip=262048 count=6 2>/dev/null | hexdump -e '1/1 "%02x"')
 		MACADDR2=$(( 0x${MACADDR} + 1))
-		MACADDR2=`printf "%012x" ${MACADDR2}`
+		MACADDR2=$(printf "%012x" ${MACADDR2})
 
-		MACADDR=`echo ${MACADDR} | sed 's/\(..\)/\1:/g' | sed 's/:$//'`
-		MACADDR2=`echo ${MACADDR2} | sed 's/\(..\)/\1:/g' | sed 's/:$//'`
+		MACADDR=$(echo ${MACADDR} | sed 's/\(..\)/\1:/g' | sed 's/:$//')
+		MACADDR2=$(echo ${MACADDR2} | sed 's/\(..\)/\1:/g' | sed 's/:$//')
 
 		uci set network.eth0.macaddr=${MACADDR}
 		uci set network.lan.macaddr=${MACADDR}

target/linux/orion/image/generic.mk

@@ -110,7 +110,7 @@ endef
 
 define Image/Default/FileSizeCheck
  # parameters: 1 = file path, 2 = maximum size in bytes
-	[ `stat -c %s '$(1)'` -le $(2) ] || { echo '   ERROR: $(1) too big (> $(2) bytes)'; rm -f $(1); }
+	[ $(stat -c %s '$(1)') -le $(2) ] || { echo '   ERROR: $(1) too big (> $(2) bytes)'; rm -f $(1); }
 endef