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my @cmd = ('tshark','-r',$PCAPFILE, qw# -R tcp.options.mss -T fields -e ip.src -e tcp.srcport -e ip.dst -e tcp.dstport -e tcp.options.mss_val #); open my $ts, '-|', @cmd or die "Error opening pipe: $!";
## from your command line $ tshark -r $PCAPFILE -R tcp.options.mss -T fields -e ip.src \ -e tcp.srcport -e ip.dst -e tcp.dstport -e tcp.options.mss_val