OnWorks favicon

flow-cat - Online in the Cloud

Run flow-cat in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command flow-cat that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



flow-cat — 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.


-a 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.

-g Sort file list by capture start time before processing.

-h Display help.

-m Disable the use of mmap().

-p 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
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

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

Use flow-cat online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

  • 1
    Open-source tool to access Amazon S3
    file storage. S3cmd is a free command
    line tool and client for uploading,
    retrieving and managing data in Amazon
    S3 and ot...
    Download s3cmd
  • 2
    XyZerKunG ServerTool
    XyZerKunG ServerTool
    XyZerKunG ServerTool helps you to make
    your own Minecraft server and play with
    your friend for a few minutes.
    Features:Automatically create a
    Minecraft serverU...
    Download XyZerKunG ServerTool
  • 3
    Java source intended to serve as a
    nexus for teaching both mathematics and
    software solutions for computation on
    iterative equations. Public interfaces
    allow a...
    Download CalcTools
  • 4
    Rocket.Chat Desktop Client
    Rocket.Chat Desktop Client
    Rocket.Chat Desktop client is the
    official desktop app for Rocket.Chat,
    the simple but powerful open source web
    chat platform. It's tested on macOS,
    Download Rocket.Chat Desktop Client
  • 5
    OfficeFloor provides inversion of
    coupling control, with its: - dependency
    injection - continuation injection -
    thread injection For more information
    visit the...
    Download OfficeFloor
  • 6
    DivKit is an open source Server-Driven
    UI (SDUI) framework. It allows you to
    roll out server-sourced updates to
    different app versions. Also, it can be
    used fo...
    Download DivKit
  • 7
    Utility to convert between various
    subscription format. Shadowrocket users
    should use ss, ssr or v2ray as target.
    You can add &remark= to
    Telegram-liked HT...
    Download subconverter
  • More »

Linux commands