RRD: Сбор информации с UPS через NUT

#!/bin/bash                                                                                                                                                     

dbfile="$1"
if [ -z "${1}" ]; then
        echo -e "
        \e[32mUsage: \e[31m$0 \e[33mRRDBFILE \e[36mUPSNAME

        \e[32mExample: \e[31m$0 \e[33m/home/$USER/myups.rrd \e[36mmyups1000va
        \e[0m"
        exit 2
fi
if [ ! -e "${dbfile}" ]; then
        echo -e "\e[31mError: Database \e[33m\"${dbfile}\" \e[31mnot exist\e[0m"
        exit 1
fi
if [ ! -e /bin/upsc ]; then
        echo -e "\e[31mError: \e[35m/bin/upsc:\e[31m no such file\e[0m"
        exit 3
fi

shift

if /bin/upsc "${@}" ; then
        rrdtool update "${dbfile}" $(/bin/upsc "${@}" | awk '
/battery.charge:/{charge=$2}
/input.voltage:/{inv=$2}
/output.voltage:/{outv=$2}
/ups.load:/{load=$2}
END {print systime()":"inv":"outv":"charge":"load}
')
else
        echo "\e[31mError: Can't get info about \e[36"${@}"\e[0m"
fi