Limit programs that can connect to the internet on OS X

Limit programs that can connect to the internet on OS X I got a 3G modem and a sim card. I have a 100MB day limit and although I mostly use firefox and thunderbird and I take care, sometimes it seems that something is using bandwidth but i do not know exactly what program.
Asked by: Guest \| Views: 367

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Guest [Entry]

"To get a list of processes that have open connections, you can use:

sudo lsof | grep -i tcp | grep ESTABLISHED"