NAME

       dftest - Shows display filter byte-code, for debugging dfilter routines.

SYNOPSIS

       dftest [ <filter> ]

DESCRIPTION

       dftest is a simple tool which compiles a display filter and shows its bytecode. Please
       refer to doc/README.display_filter for a description of the DFVM (Display Filter Virtual
       Machine) Byte Codes.

OPTIONS

       filter

           The display filter expression. If needed it has to be quoted.

DIAGNOSTIC OPTIONS

       --log-level <level>
           Set the active log level. Supported levels in lowest to highest order are "noisy",
           "debug", "info", "message", "warning", "critical", and "error". Messages at each level
           and higher will be printed, for example "warning" prints "warning", "critical", and
           "error" messages and "noisy" prints all messages. Levels are case insensitive.

       --log-fatal <level>
           Abort the program if any messages are logged at the specified level or higher. For
           example, "warning" aborts on any "warning", "critical", or "error" messages.

       --log-domains <list>
           Only print messages for the specified log domains, e.g. "GUI,Epan,sshdump". List of
           domains must be comma-separated.

       --log-debug <list>
           Force the specified domains to log at the "debug" level. List of domains must be
           comma-separated.

       --log-noisy <list>
           Force the specified domains to log at the "noisy" level. List of domains must be
           comma-separated.

       --log-file <path>
           Write log messages and stderr output to the specified file.

EXAMPLES

       Show how the IP protocol is filtered:

           dftest ip

       Shows how frame 150 is filtered:

           dftest "frame.number == 150"

SEE ALSO

       wireshark-filter(4)

AUTHORS

       Original Author
       Jan Šafránek

       Contributors
       Jaap Keuter

                                            2023-01-20                                  DFTEST(1)