Andrew Watson wrote:

> My questionis how can I output a file that I can then read / inspect?

As Jaap Keuter noted, the output of the "-w" flag isn't a text file, 
it's a binary file containing raw packet data.

Either

        1) don't use the "-w", just redirect the output, which will produce a 
text file - in UN*X text file format, *not* Windows text file format, in 
versions running on a UN*X (which CentOS is, being a Linux 
distribution), so if you're planning on reading it on a Windows system 
(as the ".txt" suggests you might be), you'll need a text editor that 
can handle files with LFs but no CRs at the ends of lines

or

        2) use "-w", and read the file with TShark or Wireshark (or any other 
program that can read libpcap-format files) rather than with a text editor.
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