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  • There is something in the filter that you must have write access to do. Commented Jan 25, 2015 at 1:45
  • I'm assuming the >> in the filter is a shift, and it's being interpreted as an output redirect and trying to create a file called "2))!=0)". The filter should just be filtering packets, not writing anything. Commented Jan 25, 2015 at 1:51
  • If you need to learn tcpdump rules, you have to read man pcap-filter Commented Jan 25, 2015 at 2:43