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-   -   tcpdump -w command doesn't write to file (http://www.linuxquestions.org/questions/showthread.php?t=152759)

andykerouac 03-02-2004 05:13 PM

tcpdump -w command doesn't write to file
 
Anyone know why when I run < tcpdump -w file > I get know output in the file specified. I get network traffic on standard output but nothing when I try to redirect to a file.

itsjustme 03-02-2004 05:54 PM

I don't know why, but, from man tcpdump:

"In all cases, only packets that match expression will be processed by tcpdump."

With expression being the last thing on the command line, or so it seems.

andrewlkho 03-03-2004 07:10 AM

If you check the man pages, this writes the *raw* package to file, hence if you view the file, you'll get a load of binary. The quickest / easiest way to write to a file is:
# tcpdump > filename


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