Added arguments to README

README.md

@@ -1,3 +1,10 @@
 # check_rpi_temperature
 
-Icinga2/Nagios check program for Raspberry Pi temperature
+Icinga2/Nagios check program for Raspberry Pi temperature
+
+## Arguments
+
+- `--warning 50`: Temperature above which the result is warning
+- `--critical 70`: Temperature above which the result is critical
+- `--fahrenheit`: All temperatures in Fahrenheit (°F)
+

check_rpi_temp.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+#
+# Created by Jonny007-MKD 2020-10-03
+
+echoerr() { echo "$@" 1>&2; }
+
+WARN=50
+CRIT=70
+FAHRENHEIT=false
+DEBUG=false
+while [[ $# -gt 0 ]]; do
+	case $1 in
+		-w|--warn|--warning)
+			case "$2" in
+				''|*[!0-9]*) echoerr "Argument for \"$1\" has to be a number";;
+			esac
+			WARN=$2
+			shift; shift
+			;;
+		-c|--crit|--critical)
+			case "$2" in
+				''|*[!0-9]*) echoerr "Argument for \"$1\" has to be a number";;
+			esac
+			CRIT=$2
+			shift; shift
+			;;
+		-f|--fahrenheit)
+			FAHRENHEIT=true
+			shift
+			;;
+		-d|--debug)
+			DEBUG=true
+			shift
+			;;
+		-?|--help)
+			echo "Check /proc/mdstat. Arguments:"
+			echo "--warning $WARN: Temperature above which the result is warning"
+			echo "--critical $CRIT: Temperature above which the result is critical"
+			echo "--fahrenheit: All temperatures in Fahrenheit (°F)"
+			exit 0
+			;;
+	esac
+	shift
+done
+
+if [ $CRIT -le $WARN ]; then
+	echoerr "Critical threshold ($CRIT) has to be greater than Warning threshold ($WARN)"
+	exit 1
+fi
+
+
+function log {
+	if $DEBUG; then
+		echo "  > $@"
+	fi
+}
+NL=$'\n'
+
+
+output=$(/opt/vc/bin/vcgencmd measure_temp)
+result=$?
+log vcgencmd: $result. $output
+if [ $result -ne 0 ]; then
+	echoerr "vcgencmd returned $result"
+	exit $result
+fi
+
+temp=${output/temp=/}
+temp=${temp/\'C/}
+
+unit="°C"
+if $FAHRENHEIT; then
+	temp=$(bc <<< "scale=1; ($temp * 1.8) + 32")
+	unit="°F"
+fi
+
+
+
+c=$(bc <<< "$temp > $CRIT")
+w=$(bc <<< "$temp > $WARN")
+if [ $c -eq 1 ]; then
+	result="CRITICAL"
+elif [ $w -eq 1 ]; then
+	result="WARNING"
+else
+	result="OK"
+fi
+echo "$result | 'temperature'=$temp;$unit;$WARN;$CRIT;-40;85"
+
+
+case $result in
+	OK)       exit 0;;
+	WARNING)  exit 1;;
+	CRITICAL) exit 2;;
+esac
+