tshark to txt ">" output command working in terminal but not in java?

Question

I am trying to output captured packet information to a .txt file. Running the below code in a terminal works (removing the " of course). However java doesn't seem to like ">". I get the following error message; tshark: A default capture filter was specified both with "-f" and with additional command-line arguments.

Process p1 = Runtime.getRuntime().exec(new String[]{"tshark","-f","tcp src port 80","-i","en0","-l",">","raw.txt"});

However if i use "-w" instead of ">" it outputs the binary data just fine.

The shell normally handles `>` rather than the application itself. — Jon Skeet, Nov 26 '20 at 16:02
Good point. I think the answer to this question should help then: https://stackoverflow.com/questions/16238714/runtimes-exec-method-is-not-redirecting-the-output — Christopher Maynard, Nov 27 '20 at 06:14

score 0 · Answer 1 · answered Nov 26 '20 at 16:00

0

Try quoting the capture filter, e.g.

Process p1 = Runtime.getRuntime().exec(new String[]{"tshark","-f","\"tcp src port 80\"","-i","en0","-l",">","raw.txt"});

answered Nov 26 '20 at 16:00

Christopher Maynard

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Unfortunately this didn't work, still getting the same error. – Angus Nov 27 '20 at 04:56

tshark to txt ">" output command working in terminal but not in java?

1 Answers1