On Sunday 19 Apr 2009, Arun Khan wrote:
Capture the line RX bytes and TX bytes into a table and sum it up at the end of the month for your totals. (write a shell script and include it in the shutdown/reboot process)
The following in _one_ line should get the ball rolling for the script
/sbin/ifconfig eth0 | egrep "RX bytes" | sed -e 's/[ ]{2, }//g' -e 's/([0-9]{1,}.[0-9]{1,} [KM]b)//g' >> <filename>
sidebar: for regular expression see this http://www.regular-expressions.info/reference.html
HTH