CODEWITHSUNDEEP
bashtcpdump
JJD
JJD

Reputation: 412

tcpdump suppress console output in script & write to file

In a bash script I need to run a tcpdump command and save the output to a file however when I do that via > /tmp/test.txt i still get the following output in the console:

tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes
1 packet captured
1 packet received by filter
0 packets dropped by kernel

However I do wnat the script to wait for the command to complete before continuing.

is it possible to supress this output?

Upvotes: 2

Views: 5511

Answers (1)

Christopher Maynard
Christopher Maynard

Reputation: 6274

The output you're seeing is written to stderr, not stdout, so you can redirect it to /dev/null if you don't want to see it. For example:

 tcpdump -nn -v -i eth0 -s 1500 -c 1 'ether proto 0x88cc' > /tmp/test.txt 2> /dev/null

Upvotes: 4

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