flow-cat - Man Page

Concatenate flow files


flow-cat [ -aghmp ]  [ -b big|little ]  [ -C comment ]  [ -d debug_level ]  [ -o filename ]  [ -t start_time ]  [ -T start_time ]  [ -z z_level ]  [ file|directory... ]


The flow-cat utility processes files and/or directories of files in the flow-tools format. The resulting concatenated data set is written to the standard output or file specified by -o. If file is a single dash (`-') or absent, flow-cat will read from the standard input.



Do not ignore filenames that begin with tmp.

-b big|little

Byte order of output.

-C Comment

Add a comment.

-d debug_level

Enable debugging.


Sort file list by capture start time before processing.


Display help.


Disable the use of mmap().


Preload headers. Use to preserve meta information such as lost flows.

-o file

Write to file instead of the standard out.

-t start_time

Select flow files up to start_time. If used with -T select files between start_time and end_time.

-T end_time

Select flow files after end_time. If used with -t select files between start_time and end_time.

-z z_level

Configure compression level to z_level. 0 is disabled (no compression), 9 is highest compression.


Process the files and/or directory.

Time/Date Parsing

start_time and end_time parsing is implemented with getdate.y, a commonly used function to process free-form time date specifications. Example usage borrowed from cvs: 1 month ago 2 hours ago 400000 seconds ago last year last Monday yesterday a fortnight ago 3/31/92 10:00:07 PST January 23, 1987 10:05pm 22:00 GMT


Concatenate all flow files begining with ft-v05.2001-05.01, use  flow-print to display the results.

flow-cat ft-v05.2001-05-01.* | flow-print

Concatenate flow files in /flows/krc4, store store the output in compressed.flows at compression level 9 (best). The headers are preloaded so various metadata such as the flow count is correct in the result. Filenames begining with tmp which are typically in-progress flow files from flow-capture are not processed.

flow-cat -p -z9 /flows/krc4 > compressed.flows


None known.


Mark Fullmer  <maf@splintered.net>

See Also


Referenced By


26 Август 2010