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tshark syntax error

asked 2018-09-12 15:39:17 +0000

cal516 gravatar image

updated 2018-09-12 15:50:29 +0000

grahamb gravatar image

I am working on an assignment and having trouble with the syntax. Below is the prompt and command I am using. I had to map to tshark then add the command.

C:\Windows\system32>"c:\Program Files\Wireshark\tshark" -x -n SYNscan.txt

Below is the error

Capturing on 'Npcap Loopback Adapter'
tshark: Invalid capture filter "SYNscan.txt" for interface 'Npcap Loopback Adapter'.

That string isn't a valid capture filter (syntax error in filter expression).
See the User's Guide for a description of the capture filter syntax.
0 packets captured
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answered 2018-09-12 15:55:58 +0000

grahamb gravatar image

Do you want tshark to write the dissection to "SYNscan.txt"? If so, then you'll have to redirect the output, e.g.

C:\Windows\system32>"c:\Program Files\Wireshark\tshark" -x -n > SYNscan.txt

Any final argument supplied to tshark without an argument prefix is treated as a capture filter.

Note also that you won't be able to write to the current directory (C:\Windows\System32) unless you're running with elevated privileges, and you shouldn't be running tshark with elevated privileges.

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Thank you for the response. I realized the error (no >) as soon as I read your response

cal516 gravatar imagecal516 ( 2018-09-12 15:59:42 +0000 )edit

If an answer has resolved your issue, then for the benefit of others looking for solutions, please accept the answer by clicking the checkmark icon next to it.

grahamb gravatar imagegrahamb ( 2018-09-12 16:31:30 +0000 )edit

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Asked: 2018-09-12 15:39:17 +0000

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Last updated: Sep 12