rdnm

#!/bin/bash
#
# RDNMcron by Subban
#
# Execute from a cron with :
# 59 23 * * * /home/subbass/bin/RDNMcrom
#
# This equals 11:59pm. When it runs it will take the days total
# from vnstat and log it, you can later parse the data in the log
# with `rdnm` in a console to check your current quota used.
#
# This script depends on vnstat being installed and working
# The following line should get it setup, correct the eth0
# depending on your active network card.
#
# vnstat -u -i eth0
#

basename=~/.rdnm
todaytotal=0
leftcrop=0
sanitised=0

#
# check if vnstat is installed, spank user if not.
#
if [ -z "$(which vnstat)" ]; then
        echo "$0: error: vnstat is not installed"
        exit 1
fi

if [ -d $basename ]; then
  touch $basename/bwdata
  touch $basename/temp
else
  mkdir $basename
  touch $basename/bwdata
  touch $basename/temp
fi

vndata=`vnstat -s`

# remove all text from the left upto and including 'today'
leftcrop=${vndata#*today}

#remove text from the right upto the last 'MiB'
#
# GiB or MiB depending on output from VNSTAT
#
#  total=$(echo "scale=2; ${total}+${part}" | bc)
#

todaytotal=${leftcrop%% MiB*}
echo $todaytotal|grep -q GiB &&
todaytotal=${todaytotal%% GiB*} &&
todaytotal=$(echo "scale=2; ${todaytotal}*1024" | bc)

#echo $todaytotal|grep -q GiB && todaytotal=$(( ${leftcrop%% GiB*} * 1024 ))


## this next section is obsolete but left intact, now I use bc in rdnm to
## calculate with the decimal places intact.
#
#this bit removes anything to the right of the decimal point
#sanitised=${todaytotal%%.*}
#echo $sanitised >> $basename/bwdata
echo $todaytotal >> $basename/bwdata

# tell the system we finished ok
exit 0