#!/bin/sh

# temperature_alert.sh
# relies on lm_sensors being installed
# On my systems this runs as a cron job
# Meryll Larkin  September 2013
# refactored array, output choices July 2020
# August 2021 added "screen_view" variable so screen output could be turned off

toohot=95
# toohot=60  # for testing purposes

# screen_view : send output to screen  yes = 1  no = 0
screen_view=0

# do you want to send email?  y = 1  no = 0
sendemail=0
# separate each email address by a space
mailto='bogus@bogus.com sugob@bogus.net'

# makelog do you want to create log to keep on server ?  yes = 1  no = 0
makelog=1

server=`hostname`

if [ $makelog -gt 0 ] ; then
    mkdir -p /root/bin/LOG
fi

datestring=$(date +"%Y%m%d")
hrMin=$(date +"%H:%M")
if [ $makelog -gt 0 ] ; then
    LOG=/root/bin/LOG/temp_${datestring}.log
    # prune logs more than 1 month old for space considerations
    find /root/bin/LOG/ -type f -mtime +31 -name 'temp_*' -exec rm {} \;
fi
tmp_array=`/usr/bin/sensors -f  |grep 'temp'| awk '{print $2}'| tr -d '+' | tr -d '°F'`

IFS=$'\n' sorted=($(sort <<<"${tmp_array[*]}"))
unset IFS
# printf "[%s]\n" "${sorted[@]}"
highest=`echo ${sorted[-1]}`
# echo "highest = $highest"

if (( $(echo "$highest > $toohot" | bc -l) )); then
    subject="$server is at $highest degrees F"
    message=`/usr/bin/sensors -f`
    if [ $makelog -gt 0 ] ; then
        echo "$datestring $hrMin $server reports temperature of $highest degrees F" >>$LOG
        /usr/bin/sensors -f >> $LOG
        echo "" >> $LOG
    fi
    if [ $screen_view -gt 0 ] ; then
        echo "$datestring $hrMin $server reports temperature of $highest degrees F"
        /usr/bin/sensors -f 
    fi
    if [ $sendemail -gt 0 ] ; then
        if [ $screen_view -gt 0 ] ; then
            echo "Found temperature of $highest, sending email"
        fi
        echo "$message" | mail -s "$subject" $mailto
    fi
fi
exit