Remove bc dependency for 30-sysinfo MOTD script

scripts/update-motd.d/30-sysinfo

@@ -3,14 +3,11 @@
 #    30-sysinfo - generate the system information
 #    Copyright (c) 2015 Igor Pecovnik
 
-
 # define which hard drive you want to monitor
 storage=/dev/sda1
 
-
 # don't edit below here
 
-
 function displaytime {
 	# we need dedicated function
 	local T=$(cat /proc/uptime | awk '{print $1}' | sed 's/[.].*//')
@@ -29,25 +26,19 @@ function displaytime {
 	printf "\x1B[92m%s\x1B[0m\t\t" "$time"
 }
 
-
-
-
 function display() {
 	# $1=name $2=value $3=red_limit $4=minimal_show_limit $5=unit $6=after $7=acs/desc{
 	# battery red color is opposite, lower number
 	if [[ "$1" == "Battery" ]]; then local great="<"; else local great=">"; fi
 	if [[ -n "$2" && "$2" > "0" && (( "${2%.*}" -ge "$4" )) ]]; then
 	printf "%-14s%s" "$1:"
-		if (( $(echo "$2 $great $3" | bc -l) )); then echo -ne "\e[0;91m $2"; else echo -ne "\e[0;92m $2"; fi
+		if awk "BEGIN{exit ! ($2 $great $3)}"; then echo -ne "\e[0;91m $2"; else echo -ne "\e[0;92m $2"; fi
 		printf "%-1s%s\x1B[0m" "$5"
 		printf "%-11s%s\t" "$6"
 		return 1
 	fi
 }
 
-
-
-
 # Battery info for Allwinner
 # kernel 4.4+
 axp_dir="/sys/power/axp_pmu"
@@ -68,8 +59,6 @@ if [[ -e "$axp_dir" ]]; then
         fi
 fi
 
-
-
 # legacy kernel
 axp_dir="/sys/class/power_supply"
 if [[ -e "$axp_dir" && -e "$axp_dir/battery" ]]; then
@@ -147,7 +136,7 @@ if [[ -n $(which temper) && $(dpkg --print-architecture) == armhf ]]; then
    amb_temp=$(temper -c)
    if echo $amb_temp | egrep -qv "Couldn't find the USB device"; then
 	  amb_temp=$(echo $amb_temp | awk '{print $NF}' |  sed 's/C//g')
-	  amb_temp=$(echo "scale=1;${amb_temp}/1" | bc)
+	  amb_temp=$(echo "scale=1;${amb_temp}/1" | grep -oE "\-?[[:digit:]]+.[[:digit:]]")
   else
       amb_temp=""
   fi