sending output to a file

[lda]

I am sure there is a way to send the output from tcpdump to a text file, I just don't know the syntax and the man page isn't very informative.

Any Ideas?

[Radar]

I've never used tcpdump, but to send output of a command to file, it's [command] > outfile.

example: cat firewall.log | grep tcp > firewall.txt

[z0mbix]

Originally posted by Radar
I've never used tcpdump, but to send output of a command to file, it's [command] > outfile.

example: cat firewall.log | grep tcp > firewall.txt

or just grep tcp firewall.log > firewall.txt

[lda]

Thanks for the syntax gang but, tcpdump is a packet sniffer and runs from the command line so the output is constantly updating. I do not think that cat or grep will work in this case. But, I thank you for the ideas. If you have any others please offer.

Thanks

[TacKat]

You don't use grep or cat, just the > operator. Assuming you just run tcpdump and it spits out all the info, just do

tcpdump > file_here

You can use >> instead of > if you want to append to a file instead of overwrite it.