custom bash script

#!/bin/bash

mib=".1.3.6.1.4.1.674.10892.1.700.20.1.6.1.1"
chk_bin="/usr/local/nagios/libexec/check_snmp"
echo="/bin/echo"
bc="/usr/bin/bc"

host=${1}
c_string="password123" # Community_String
t_low=${2}      # e.g. 280
t_high=${3}     # e.g. 330



t=$(${chk_bin} -H ${host} -C ${c_string} -o ${mib})
t=${t##*=}
if [ ${t} -ge ${t_high} ] ; then
        ${echo} "Input Temperature CRITICAL - *$(${echo} "${t} / 10"|${bc})C* | iso${mib}=${t}"
        exit 2
elif [ ${t} -ge ${t_low} ] ; then
        ${echo} "Input Temperature WARNING - *$(${echo} "${t} / 10"|${bc})C* | iso${mib}=${t}"
        exit 1
elif [ ${t} -lt ${t_low} ] ; then
        ${echo} "Input Temperature OK - $(${echo} "${t} / 10"|${bc})C | iso${mib}=${t}"
        exit 0
else
        ${echo} "Temperature Input problem - No data received from host"
        exit 1
fi